It is by no means clear ________ the president can do to end the strike．

A．how

B．which

C．that

D．what

"Life is like walking in the snow", Granny used to say, "because every step ________

A．has shown

B．is showing

C．shows

D．showed

Sarah looked at ________ finished painting with ________ satisfaction．

A．不填; a

B．a; the

C．the; 不填

D．the; a

Mum, I was wondering if you could lend me a few dollars until I ________ on Friday．

A．get paid

B．got paid

C．have paid

D．had been paid

The newcomer went to the library the other day and scarched for ________ he could find about Mark Twain．

A．wherever

B．however

C．whatever

D．whichever

Jack is a great talker．It's high time that he ________ something instead of just talking．

A．will do

B．has done

C．do

D．did

Not until he retired from teaching three years ago ________ having a holiday abroad．

A．he had considered

B．had he considered

C．he considered

D．did he consider

I feel so excited! At this time tomorrow morning I ________ to Shanghai．

A．will be flying

B．will fly

C．have been flying

D．have flown

Leave your key with your neighbor ________ you lock yourself out one day．

A．as long as

B．even though

C．in case

D．as if

This machine is very easy ________．Anybody can learn to use it in a few minutes．

A．operating

B．to be operating

C．operated

D．to operate