What's the population of China?(改為同義句)

　　_______ _______ is the number of people in China?

To understand what he is saying is too difficult. (改為同義句)

　　_______ _______ too difficult to understand what he is saying.

I don't like this shirt because it is too thin for me. (改為同義句)

　　I ______ ______ this shirt because it isn't large enough for me.

(用括號內(nèi)所給動詞的適當(dāng)形式填空) Don't forget _____ (close) the windows when you leave your room.

(用括號內(nèi)所給動詞的適當(dāng)形式填空) _______ you ever _______ (see) that man over there,　Alice?

(用括號內(nèi)所給動詞的適當(dāng)形式填空) His father was ill.　He had to ________ (stay) at home today.

(用括號內(nèi)所給動詞的適當(dāng)形式填空) When ______ your classmate _______ (come) into his class this morning?

(用括號內(nèi)所給動詞的適當(dāng)形式填空) By the time we got home,　my mother ______ (go) out for a walk.

(用所給單詞的適當(dāng)形式填空) In the USA 16th birthday parties are usually important _____ (celebrate)　for teenagers．

(用所給單詞的適當(dāng)形式填空) The _____ (prepare)　takes a long time and everything will look beautiful.