________ the youngsters are fond of R＆B．

A．One-four of

B．One-fourth of

C．First-four of

D．A quarter

The research is so designed that once ________ nothing can be done to change it．

A．begins

B．having begun

C．beginning

D．begun

I insist that a doctor ________ immediately．

A．has been sent for

B．sends for

C．will be sent for

D．be sent for

When it became much ________, we had to change from our coats and trousers ________ T-shirts and shorts．

A．warmer, into

B．colder, into

C．cooler, for

D．hotter, to

________, and you will pass the entrance examination in three years．

A．If study

B．Studying

C．Study

D．To study

－You are sure to have ________ at the party tonight!

－I don't think there will be ________．

A．fun, a fun

B．some fun, some fun

C．a fun, fun

D．some fun, a fun

－I'm going to Japan．

－How long ________ you ________ there?

A．are, stayed

B．are, staying

C．have, stayed

D．did, stay

The wife went out to the market, ________ some meat and carried it back home ________．

A．buying, some day

B．bought, the other day

C．to buy, one day

D．bought, some day

________ the mountain road was hard work ________ to go down the hills was great fun．

A．To climb, and

B．Climbing, and

C．To climb, but

D．Climb, but

________ you make a promise, you should keep it．

A．Unless

B．Though

C．Once

D．Even if