词汇运用。(每小题1分，满分15分)
A)根据句意及汉语提示，拼写单词，使句子完整、正确。
These exchange students are from different            (国家).
My bike is       (损坏的), so I have to walk to school these days.
These volunteers can help people with all kinds of        (问题).
"Simon,     (检查) your homework carefully,” the mother says to the little boy.
----Who are you        (担心) about, Madam?  ----My little son. I can't find him now.
B)根据句意并用括号内所给，单词的适当形式填空，使句子完整、正确。
This is my__________(twenty) time to see the singer. He looks very cool.
Daniel is a kind and        (help) boy, and we all like him.
The little girl is always the first        (come) to school on weekdays.
Thanks for       (invite) us to visit your new house.
Our teacher says that one of the    (visit) will come to our school next week.
My father is a       (cook) in a big restraint in our town. He is good at cooking.
Why not ask a computer engineer        (fix) your computer？
We are really       (luck) to go to the Hong Kong Disneyland.
The song Two Butterflies(蝴蝶)         (sound) wonderful. I like it very much.
My new flat is really different from        (they).