根据句意，用括号中所给单词的适当形式填空.

Linda couldn't see Davy ________ (where).

Mother ________ when I got home.(cook)

Look!The police ________ the traffic．(watch)

What else do you want?(改为同义句)

What ________ ________ would you ________ ?

He borrowed a bike from me.(改为同义句)

I ________ a bike ________ him.

John needs some help.(改为一般疑问句)

________ John ________ ________ help?

He taught English himself.(改为同义句)

He ________ English ________ ________.

My sister is too young to join the army.(改为同义句)

My sister ________ old ________ to join the army.

They should buy some new clothes.(对划线部分提问)

________ ________ they buy?

用所给动词的适当形式填空.

I'm very upset and don't know what ________.(do)