All possible means ______. However, nothing can _____ his wife dying of lung cancer.
| A．has tried; stop | B．have tried; keep |
| C．have been tried; prevent | D．has been tried; stop |
This little girl can speak many ___.
| A．language | B．languages | C．sentence | D．word |
He told his friends that he ___ what he was reading at the same time the day before.
| A．was just asked | B．just asked | C．had just asked | D．had just been asked |
They ___ every means, but the engine __ work.
| A．tried; couldn't | B．have tried; won't | C．tried; won't | D．have tried; can’t |
The workers ___ busily when the boss came to look for something she ___ in the office.
| A．had worked; had left | B．were working; had left | C．working; had left | D．had worked; left |
Her brother___ while he ___ his big horse and had his leg broken.
| A．fell; was riding | B．fell; ride | C．had fallen; was riding | D．had fell; rode |