________ had the bell rung ________ the students took their seats．

A．Hardly；when

B．No sooner；when

C．Hardly；than

D．No sooner；then

These planes can fly ________ than the old ones．

A．as fast three times

B．three times as fast

C．three times fast

D．three times faster

It wasn’t long ________ he joined the job．

A．that

B．before

C．until

D．and

The vase on the left is ________ than the one on the right, and not ________．

A．more nicer；so expensive

B．much more better；as expensive

C．nicer；as expensive

D．better；such expensive

We can get there on time ________ the car doesn’t break down．

A．while

B．as long as

C．so that

D．even if

Don’t be discouraged ________ you have fallen behind others．

A．whether

B．as if

C．even if

D．however

________, he is good at drawing．

A．To be a child

B．A child as he is

C．As a child

D．Child as he is

I had been to Beijing long ________ you visited it．

A．before

B．till

C．after

D．when

Bill must have been away from the office．________ how many times I phoned him, nobody answered it．

A．Whatever

B．No matter

C．In spite of

D．Though

________ the headmaster comes, we won’t discuss this plan．

A．Unless

B．If not

C．Except

D．Whether