________(学英语)________is not easy.

用括号中所给的汉语补充句子：

It's useful ________(我们学好一门外语)．

用所给动词的适当形式填空：

Mike ________ (be) ill for two weeks . He ________ (send) to hospital last week. The doctor ________ (say) he ________ (have) a high fever. He ________ (tell) to take the medicine three times a day and have a good rest. The doctor ________ (say) he ________ (be) all right soon.

用所给动词的适当形式填空：

So far, many man-made satellites ________ (send) up into space.

用所给动词的适当形式填空：

Was Mr Green ________ (find) in his office?

用所给动词的适当形式填空：

This machine ________ (can not, mend).

用所给动词的适当形式填空：

If this man ________ (catch) in our school, we'll send him to the police station.

用所给动词的适当形式填空：

The man ________ (catch)and then sent to the police station by us yesterday.

用所给动词的适当形式填空：

How many times ________ your parents ________ (visit) our school this year?

用所给动词的适当形式填空：

　　－Where ________ you ________ (buy) the book?

　　－I bought it in a shop near our school.