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Rice must be harvest ________ the right time．

A．in

B．on

C．at

D．for

It's best to plant trees in ________．

A．spring

B．summer

C．autumn

D．winter

Speak clearly ________ they may understand you．

A．so that

B．because

C．while

D．that

We have learned over three thousand English words．

A．more than

B．about

C．less than

There are a lot of people over there．

A．some

B．many

C．a few

Make sure who will go to the farm，please？

A．Look for

B．Are you sure

C．Find out

She was able to swim when she was six years old．

A．had to

B．could

C．must

There is a big table in the middle of the room．

A．in the centre of

B．in the front of

C．in the back of

—I don’t like cats．Cats aren’t friendly enough．

— ________do I．

A．So

B．Either

C．Neither

D．Also

He is outstanding ________ the runners．

A．among

B．between

C．of

D．from