Only when in the afternoon able to leave．
| A．the match was over; they were | B．was the match over; were they |
| C．was the match over; they were | D．the match was over; were they |
____ some teenagers don’t realize is ____ difficult life can be after they get addicted to drugs.
| A．What；how | B．What；what | C．That；how | D．That；what |
Among Asimov's most famous works of science fiction, one _____he won an award, was the Foundation Trilogy.
| A．of whom | B．of which | C．for whom | D．for which |
Some retired people have nothing to do. They often get together and ____for hours talking about their past experiences.
| A．look around | B．get around | C．turn around | D．sit around |
The British are proud of the 2012 Olympic Games_____ in London.
| A．to hold | B．to be held | C．holding | D．being held |
---Has your father come back from Africa?
--- Yes, but he ______ here for only three days before his company 
sent him to Japan.
| A．was | B．has been | C．will be | D．would be |