— Jenny took the 8:00 bus to Guangzhou this morning.
— Really? He the 9:00 train. It's much more comfortable and safer to travel by train.
| A．could have taken | B．should take | C．must have taken | D．can take |
Come and see me whenever _____.
| A．you are convenient | B．you will be convenient |
| C．it is convenient for you | D．it will be convenient for you |
They covered the body of the little hero with a flag, ____his face to the public.
A to expose B exposing C exposed D expose
To our surprise, the man looking very rude____ his son very carefully.
| A．take care | B．look after | C．attended | D．All of the above |
The theory he ____ about black hole isn’t understood by most of people.
A .put up B put down C put off D put forward
It will be many years ______ the doctors and medical scientists can find _____ for cancer.
| A．since; cures | B．when; treatments |
| C．before; cures | D．until; treaments |