－Where ________ our football? I can't find it anywhere.

－I ________ it under your desk. But now it's gone.

[　　]

A．did you put, have put

B．were you putting, have put

C．had you put, was putting

D．have you put, put

We ________.

[　　]

A．will leave until your son comes back

B．will leave until Tom will come back

C．won't leave until Tom comes back

D．won't leave until Tom will come back

________ on the train when it started to move.

[　　]

________ five years since I became a teacher.

[　　]

I ________ going camping with my partners next Saturday.

[　　]

The assistant ________ the task by the time his boss cones back.

[　　]

A．will have been finishing

B．will finish

C．will have finished

D．will be finishing

By the time I hurried to the airport, the plane ________.

[　　]

A．took off

B．had already taken off

C．had already been taken off

D．was taken off

He ________ the street when he was knocked down by a car.

[　　]

Chris was worried. She ________ her lost purse all day.

[　　]

When mother came in, the twins ________ a talk.

[　　]