Older people ________ well．

A．looks after

B．must be looked after

C．must look after

D．looked after

Who ________ this book ________?

A．did; written

B．was; written by

C．has; written

D．was; written

He says that Mr．Zhang ________ to the factory next week．

A．is sent

B．would send

C．was sent

D．will be sent

I ________ in summer．

A．born

B．was born

C．have been born

D．am born

The Great Wall ________ all over the world．

A．knows

B．knew

C．is known

D．was known

－When ________ the flowers ________?－Two hours ago．

A．did; water

B．was; watered

C．are; watered

D．were; watered

A lot of things ________ by people to save the little girl now．

A．are doing

B．are being done

C．has been done

D．will be done

How many trees ________ during this year?

A．are planted

B．will plant

C．have been planted

D．planted

A talk on Chinese history ________ in the school hall next week．

A．is given

B．has been given

C．will be given

D．gives

So far, the moon ________ by man already．

A．is visited

B．will be visited

C．has been visited

D．was visited