When I walked past her room， she_______ an English song.

A. singing  B. was singing  C. sang  D. sing

- He________ if he is free.

A. will come         B. comes      C. come      D. Came

—What was Tom doing _______ it was raining?

—He was doing his homework in the bedroom.

A. since  B. while   C. for   D. who

Some scientists believe that there       more robots in the future.

A will have          B. will has

C. will be  D. Are

They ________ TV at ten o’clock last night.

A. was watching            B. were watching

C. watched                 D. Watches

It will be difficult ________ a robot_________ same things as a person，

A. of， do             B. for， to do

C. for， doing  D. for， do

I’m hungry. Would you mind ______me something to eat?

A. give   B. to give   C. giving   D. Gives

--What about your study?

--I found ______ very difficult ______ all the subjects well.

A. it； learn               B. that； to learn

C. it； to learn           D. it；  learning

.--Could I use your bike?

-- _______.

A. Sorry， you could   B. Sure

C. No， you could  D. You could use someone else’s

Could you please ______ me a hand?

A．to give     B. give      C. giving      D. Gives