用所给词的适当形式填空。

Have you ever seen the raising of the ________(nation)flag?

用所给词的适当形式填空。

Guilin is famous for its ________(colour)caves．

用所给词的适当形式填空。

The hotel in Beijing are ________(comfortable)．

根据所给英文提示，完成下面句子。

The earth is becoming more and more ________(crowd)in 2100．

根据所给英文提示，完成下面句子。

Simon often tells funny jokes to make us ________．(laugh)

根据所给英文提示，完成下面句子。

This kind of skirt is very ________(fashion)and sells well．

根据所给英文提示，完成下面句子。

Every student will have a virtual ________(real)computer on Mars．

根据所给英文提示，完成下面句子。

Space travel will make many people feel ill, so the journey to Mars will be very ________．(comfortable)

用所给词的正确形式填空。

Trees and grass play an important part in ________(help)improve our environment．

用所给词的正确形式填空。

More people are getting to know the ________(important)of environmental protection．