根据句意，用所给词的适当形式填空。

I don't understand what they are saying because they speak too ________(quick)．

根据句意，用所给词的适当形式填空。

－Do you have a pen pal, Jeff?

－Yes．He's an ________(America)boy．

根据句意，用所给词的适当形式填空。

The famous ________(sing)is going to give a concert to raise money for charity．

根据下面句子的意思，用括号中所给词的正确形式填空，每空限填一词。

Computers are ________(wide)used in our daily life．

根据下面句子的意思，用括号中所给词的正确形式填空，每空限填一词。

Before making an important ________(decide), think it over．

根据下面句子的意思，用括号中所给词的正确形式填空，每空限填一词。

It’s hard to give up ________(smoke), but you have to．

根据下面句子的意思，用括号中所给词的正确形式填空，每空限填一词。

Jim is fond of sports now, so he is much ________(healthy)than before．

根据下面句子的意思，用括号中所给词的正确形式填空，每空限填一词。

He is going to celebrate his ________(forty)birthday this Saturday．

用括号内所给动词的适当形式填空。

He said that he ________(come)back in five minutes．

用括号内所给动词的适当形式填空。

He kept on ________(talk)until the class was over．