Not only adults but also teenagers have problems in their life. Here is {#blank#}1{#/blank#} survey showing the main problems of teenagers.

    They feel stressed because they have too much homework to do {#blank#}2{#/blank#} at school and at home. They have lots of exams {#blank#}3{#/blank#} (take). And parents usually send them to different classes at weekends. {#blank#}4{#/blank#} a result, many of them almost become bookworms(书虫). On most {#blank#}5{#/blank#} (holiday), they could hardly have their own time to do the things {#blank#}6{#/blank#} they are interested in. Now more and more teenagers {#blank#}7{#/blank#} (get) short-sighted(近视).

    They often read in bed or keep {#blank#}8{#/blank#} (read) for a long time without having a rest. Some of them are crazy about playing computer games. Some watch TV too much. Another serious problem among teenagers is that many of them are becoming fat {#blank#}9{#/blank#} (easy). They eat too much junk food, {#blank#}10{#/blank#} they take little exercise. I think teenagers should think of ways to deal with the problems. They should make a plan for study and hobbies and find time to relax as much as possible.

    Plenty of people dream of going to Mars(火星).{#blank#}1{#/blank#}different from those people, 16- year- old Alyssa Carson has been working{#blank#}2{#/blank#}(happy) for that dream since she was at the age of 4, according to a news report which was made by the BBC a few years{#blank#}3{#/blank#}(before).

    Alyssa tells the BBC, "I hope{#blank#}4{#/blank#}(go) to Mars because it is a place that no one has been to before. I want{#blank#}5{#/blank#}(take) the first step." According to the BBC, she has attended the USA's three world space camps so far.

    Her father, Bert Carson, tells the BBC that Alyssa plans to be on the first long journey to Mars, which is expected to take place in{#blank#}6{#/blank#}year of 2033. "We are proud{#blank#}7{#/blank#}her," he says. "We have the next sixteen{#blank#}8{#/blank#}(year) planned out. "One of those plans is Alyssa attending the International Space University.

    Of course, Alyssa's dream may come with{#blank#}9{#/blank#}(big) sacrifices(牺牲)than others. If Alyssa goes to Mars, maybe it is very{#blank#}10{#/blank#}(difficulty) for her to return to Earth. Still, her father says, "If that's the only choice she has, she still wants to go." Alyssa agrees.