A good storyteller must be able to hold his listeners' curiosity ________ he reaches the end of the story．

A．when

B．unless

C．after

D．until

Come and see me whenever ________

A．you are convenient

B．you will be convenient

C．it is convenient to you

D．it will be convenient to you

________ I know the money is safe,I shall not worry about it．

A．Even though

B．Unless

C．As long as

D．While

He made a mistake,but then he corrected the situation ________ it got worse．

A．until

B．when

C．before

D．as

Don’t be afraid of asking for help ________ it is needed．

A．unless

B．since

C．although

D．when

Scientists say it may be five or six years ________ it is possible to test this medicine on human patients．

A．since

B．after

C．before

D．when

We were told that we should follow the main road ________ we reached the central railway station．

A．whenever

B．until

C．while

D．wherever

________ I accept that he is not perfect,I do actually like the person．

A．While

B．Since

C．Before

D．Unless

It was evening ________ we reached the little town of Winchester．

A．that

B．until

C．since

D．before

I do every single bit of housework ________ my husband Bob just does the dishes now and then．

A．since

B．while

C．when

D．as