－________ was it ________ they discovered the entrance to the cave of the ancient paintings?

－It’s by accident．

A．How; that

B．What; when

C．When; what

D．Where; that

At that moment I heard a noise to my side and turned my head．________ a giant black wolf．

A．There stands

B．There stood

C．Here stands

D．Here stood

Years of efforts ________ when they saw the pictures of the moon sent back to the earth by Changel．

A．showed off

B．took off

C．paid off

D．went off

The secret of success is to be ________ existence, to be always calm, and to let each wave of life wash us a little farther up the shore．

A．in hope of

B．in harmony with

C．in need of

D．in honour of

There are many valuable services which the public are willing to pay for, but which ________ a return in money to the community．

A．doesn’t bring

B．haven’t brought

C．don’t bring

D．hasn’t brought

I guarantee you ________ be rewarded for any useful clues to the missing document(文件)of the local Health Department．

A．shall

B．may

C．have to

D．would

Tell me, Mr．Mentakis, was Mrs．Smith one of your ________ customers?

A．regular

B．common

C．average

D．usual

What impresses me most is ________ he appears in front of others, he wears a sincere and charming smile．

A．which

B．that

C．where

D．that whenever

________ to a university in the UK, international students must display a strong ability in spoken and written English．

A．Having been admitted

B．To be admitted

C．Being admitted

D．Admitted

I’ll never forget such an attractive city ________ I spent many happy hours there with my classmates last summer holidays．

A．that

B．where

C．in which

D．because