The wreckage of something like a jet plain discovered in the heart of the desert is believed ______ a UFO and _______down for reasons still mysterious.
| A．to be; have fallen | B．to have been; to have fallen |
| C．to be; to fall | D．having been; having fallen |
____ of the land in my hometown ____
covered with trees and grass.
| A．Two-fifths; is | B．Two-fifth; are | C．Two-fifth; is | D．Two-fifths; are |
I failed again in the examination and only then _____ how much time I had wasted.
| A．I realized | B．I had realized | C．did I realize | D．had I realized |
She knows so much about England. She ________ there before.
| A．must be | B．must have been | C．must live | D．must have lived in |
There are all kinds of dolls in the shop. _________ she wants, the little girl’s parents are ready to buy it for her.
| A．However | B．Whatever | C．Whichever | D．Whenever |
After he was knocked down by a bike, he was badly hurt and had to ______ to his feet.
| A．stand | B．struggle | C．run | D．sit |