She is late. What _____have happened to her?
A should B must C can D would
The police ________ the lost child and tried to find his parents.
| A．took up | B．took in | C．took over | D．took after |
It’s very hard for Mary to work here, for ______ she does can’t satisfy her boss.
| A．what | B．whatever | C．which | D．whichever |
______ that he has wasted too much time, the boy is determined to stop playing video games.
| A．Realized | B．Realizing | C．To realize | D．Having realized |
—Can you lend me the book Gone with the Wind?
—Sorry. I returned it to the library just now. Maybe it is still ______.
| A．affordable | B．acceptable | C．available | D．avoidable |
China recently tightened its waters controls near the Huangyan Island to prevent Chinese fishing boats from _______ in the South China Sea.
| A．attacking | B．having attacked |
| C．being attacked | D．having been attacked |