Sometimes, we see some people reading books while biting their nails (咬指甲). According to the BBC(英国广播公司), up to 45 percent of teenagers bit their nails. There is not an exact answer to{#blank#}1{#/blank#}   why people bite their nails. But most commonly, nail biting is said to be a nervous habit. It is done  {#blank#}2{#/blank#}  of stress(压力), boredom or excitement.

 What's more, a report says that people with higher levels of intelligence(智力)  {#blank#}3{#/blank#}  biting their nails at an early age. It believes that compared  {#blank#}4{#/blank#}  common person,  {#blank#}5{#/blank#}   with higher levels of intelligence may feel higher levels of stress more easily.

 This habit is   {#blank#}6{#/blank#}   for the biters. It can give them red or sore fingertips. And long-term nail biting can affect(影响)   {#blank#}7{#/blank#}   nails grow.

 But don't worry! There are many   {#blank#}8{#/blank#}  to stop biting your nails. First, keep your nails clean. The more you focus on taking care of your nails, the  {#blank#}9{#/blank#}   likely you may bite them again. Also, when you feel stressed, try to relax.  {#blank#}10{#/blank#}  exercise or having a warm bath both help.

(1) Take some rest after lunch and you won't feel {#blank#}1{#/blank#} in the afternoon. .

(2)When the child saw her parents waiting at the school gate, she ran {#blank#}2{#/blank#}  them.
(3)Don't {#blank#}3{#/blank#}  about your exams, everything will be fine.
(4)To protect{#blank#}4{#/blank#} , scientists suggest the people stop fishing in some parts of the ocean.
(5)My host family is really nice .They try{#blank#}5{#/blank#}  best to make me feel at home .

    Now online shopping，a new way of shopping，is{#blank#}1{#/blank#}our way of life．

    It has some advantages．First，we are able to{#blank#}2{#/blank#}at any time because online shops are open all day．Second，it's easy for us to shop online because we only need a computer and a mouse．Third，we can{#blank#}3{#/blank#}the prices of the same product to save money．

It also has some disadvantages．First，paying over the Internet is sometimes{#blank#}4{#/blank#}.

    Second,we can only see pictures instead of real{#blank#}5{#/blank#}．

    In the future，nobody will shop in the real shops．