The Smiths ________ come to our party tomorrow evening.

[　　]

When you are ________ trouble, please ask ________ help.

[　　]

His mother looked ________ when she lost her wallet.

[　　]

I was cooking when there was a knock ________ the door.

[　　]

As he wasn't in then, I ________ him a message on the desk.

[　　]

Please ________ for a moment, mother has a few words with you.

[　　]

Where ________ my pen? I can't find it anywhere.

[　　]

A．have you put

B．did you put

C．were you putting

D．do you put

Three years ________ since I left my hometown.

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One day people ________ go to the moon on holiday.

[　　]

She says she 　　　  until tomorrow.　

[　　]

A． isn't free　　　　　　B．won't free

C．won't be free　　　   D．will free