The plane will take off ________ three hours．I must get to the airport right now．

A．in

B．for

C．on

D．at

Beijing is ________ capital of China and it is ________ city with many places of interest．

A．a; a

B．a; the

C．the; a

D．the; the

The teacher told Ann ________ too much time ________ computer games,

A．not to spend; at

B．to not spend; on

C．didn't spend; playing

D．not to spend; playing

We mustn't waste water ________ there isn't enough clean water on the earth．

A．so

B．until

C．because

D．but

The mother with her little son ________ at my home ________ that snowy night．

A．were, at

B．was, at

C．were, on

D．was, on

The first thing ________ my brother is going to do this afternoon is to write a letter．

A．which

B．that

C．why

D．who

The silk dress ________ so smooth．It's made in China．．

A．feels

B．smells

C．sounds

D．tastes

When I returned．I saw him ________ on the bed．

A．laying

B．lying

C．lay

D．lie

Our teacher ________ in our school for 29 years and he ________ here when he was 23 years old．

A．has taught has come

B．taught, comes

C．taught, came

D．has taught, came

Fred plays ________ piano after ________ supper every day．

A．the; the

B．/; the

C．the;/

D．/;/