We can't see ________ sun and ________ moon at ________ same time．

A．the; the; the

B．a; a; the

C．the; the; a

D．the; the;/

They ________ on the grass, enjoying the sunshine．

A．sit

B．are sitting

C．sat

D．will sit

You can do some reading while you ________ for the train．

A．wait

B．have waited

C．are waiting

D．waited

He ________ to New York tomorrow．

A．flies

B．is flying

C．flew

D．has flown

－May I use your typewriter?

－I am afraid not．I ________ it．

A．am using

B．using

C．use

D．used

Today Jim ________ his white shirt and brown trousers．

A．is putting on

B．wear

C．put on

D．is wearing

There must be ________ in this wood．

A．else something

B．anything else

C．something else

D．else anything

She ________ on a chair under the tree, reading English．

A．lies

B．lay

C．is lying

D．sits

Trees live ________ than people．

A．long

B．much long

C．much longer

D．more longer

One and a half hectares of trees could produce enough oxygen to keep your whole class ________ for a year．

A．live and health

B．alive and healthy

C．alive and healthy

D．live and healthy