根据所给汉语提示完成句子

l. If you can't speak good English, you'll be at a big _____ (不利) when you try to get a job.

2. My rnom said she would buy me a new _____ (个人的) computer if' I got good grades in the coming exams.

3. -Did you open your present ?

    -That box?  Is it for me? I thought you _____ (给) it to my brother, Sam.

4. Don't leave all the _____ (孩子) in the big house. I think it will .be a little dangerous!

5. With the teacher's help, John made much _____ (进步) in this semester.

自救器开启后只能使用（）不能重复多次使用。

A、一次

B、二次

C、三次