—What are those?
—________ cows.

A．It's

B．They're

C．Those

用所给词的适当形式填空。
【小题1】The teacher can answer the questions __________ (easy).
【小题2】Wei Hua ________ (meet) Yang Ling on River Road this morning.
【小题3】Some _________ (child) run or play on the road.
【小题4】Let’s finish ________ (they) quickly.
【小题5】What must Liu Tao _________ (do) in the library?
【小题6】We should keep _________ (health).
【小题7】You must stay _________ (safe) on the road and cross it _________ (safe).
【小题8】You mustn’t run ___________ (quick) on the road.
【小题9】The bus is _________ (stop) on the road.

将左右相匹配 
（1）cows ________    

A．这些
（2）cats ________

B．奶牛（复数）
（3）this ________

C．猫（复数）
（4）these ________

D．这
（5）they ________

E．他们

—Where were the cakes? (   )
—_______ on the first floor.

A．It was

B．They were

C．They are

Let’s的完整形式是：________  ( )

A．Let us

B．Let is

C．Let as