The students were ________ over the ________ problem, listening to the teacher with a ________ expression on their faces．

A．puzzled;puzzling;puzzling

B．puzzled;puzzling;puzzled

C．puzzling;puzzling;puzzled

D．puzzling;puzzled;puzzling

The two sides have reached a partial agreement, but several differences still ________ between them．

A．happen

B．exist

C．survive

D．appear

The National Stadium which looks very magnificent ________ 258, 000 square metres in area．

A．is measuring

B．is measured

C．measured

D．measures

There was a hole in the door, through which I ________ sight of Mr．Brown sitting in a chair．

A．caught

B．made

C．took

D．got

The sports meeting will be held on the playground this weekend, if weather ________．

A．permits

B．promises

C．agrees

D．allows

Do you have any idea ________ on earth has happened to our friend?

A．that

B．what

C．as

D．which

A big bush fire ________ in Australia last night, but fortunately everyone ________ escape．

A．took place; could

B．happened; can

C．broke out; was able to

D．happened; could

________ she couldn't understand was ________ fewer and fewer students showed interest in her lessons．

A．What; why

B．That; what

C．What; because

D．Why; that

The little chick ________ the earthworm, deciding whether to swallow it or let it go．

A．stared at

B．glimpsed at?

C．looked into

D．glared at?

The road is covered with snow．I can't understand ________ they insist on going by motorbike．

A．why

B．whether

C．when

D．how