Happiness means different things to different people. For Mary, who has {#blank#}1{#/blank#} severe sleeping problem, happiness is as simple as having a good night's sleep.

    Bed was once a place {#blank#}2{#/blank#} Mary went to rest after a long, hard day. {#blank#}3{#/blank#}, she has not had a full night's sleep in almost six months. Her doctor said that {#blank#}4{#/blank#} (count) sheep might help her fall asleep. She tried this, but soon got tired of it after it failed to work. She finds the nights without sleep almost {#blank#}5{#/blank#} (bear) . She is always sleepy and lacks energy during the day.

    Mary is not alone. Studies show that more than one in three people worldwide struggle with getting enough sleep. It often takes on different {#blank#}6{#/blank#} (form) : some people can get to sleep, but wake up much too early; some get a full night's sleep, but are {#blank#}7{#/blank#} (disappoint)  to find that they still feel tired when they wake up; others, like Mary, find {#blank#}8{#/blank#} difficult to fall asleep in the first place.

    Specialists say that people should not worry too much about this problem. In most cases , a lack of sleep {#blank#}9{#/blank#} (cause) by anxiety and pressure. It is important to keep yourself {#blank#}10{#/blank#} good spirits and to be positive. 

When people {#blank#}1{#/blank#}(face) with health or nutrition questions, it is {#blank#}2{#/blank#}(increasing) common to go online and diagnose themselves. But the Internet is full of conflicting health warnings with no regulations to get rid of the wrong advice, some of {#blank#}3{#/blank#} is extremely dangerous! Also, search engine's rank results from popularity rather than accuracy, {#blank#}4{#/blank#} solid facts can be tricky to find. It is worth {#blank#}5{#/blank#}(check) if the writer of an online piece is properly qualified as an expert. Anyone can call {#blank#}6{#/blank#}(they) a "diet expert" "nutritionist" and even a "doctor" — given it could refer to qualifications like a PhD. But remember, only officially {#blank#}7{#/blank#} (recognize) practicing doctors as well as dietitians have degrees in giving medical {#blank#}8{#/blank#}(suggest). So if you are unsure and still wondering {#blank#}9{#/blank#} the chocolate diet really does work or not, then it pays to make {#blank#}10{#/blank#} appointment with your dietitian or doctor. The truth is out there, and you just need to look in the right place.

China successfully landed the Chang'e 4 lunar probe (月球探测器) on the far side of the moon on January 3, 2019, becoming the only country in history  {#blank#}1{#/blank#} (touch) the lunar surface unseen by those on Earth. The far side of the moon has been seen and mapped {#blank#}2{#/blank#}(previous) by astronauts of the Apollo missions. But it is the first time that the moon's far side{#blank#}3{#/blank#}(set) foot on by spacecraft, and the successful landing of Chang'e 4 is seen as a major milestone in space{#blank#}4{#/blank#}(explore).

The Chang'e 4 spacecraft consists{#blank#}5{#/blank#}two parts: a lander and a rover (巡视器). Representing China's{#blank#}6{#/blank#}(new) step in the lunar probe project of all time, it landed at 10: 26 am of Beijing time. Then it sent back a photo of the landing place.{#blank#}7{#/blank#}(shoot) through cameras on the probe's lander, the photo marks the world's first image taken on the surface of the far side of the moon. One of the photos published by the China National Space Administration shows the place{#blank#}8{#/blank#}Chang'e 4's rover — named Yutu 2 — will be heading hours later for{#blank#}9{#/blank#}purpose of conducting further research. The name Chang'e has its roots in the Chinese goddess of the moon. In the ancient tale, Chang'e{#blank#}10{#/blank#}(fly) to the heavens and landed on the moon as her final resting place.