Tu Youyou，the 81yearold doctor，has become the first scientist on the Chinese mainland ________a Lasker Award.
| A．winning |
| B．won |
| C．to win |
| D．win |
According to the police, _______ some facts undiscovered.
| A．it seems that | B．it seems to be | C．there seem to be | D．here seem |
Recent pressure at work may________ his behavior.
A.accounts for B. pay for C. stand for D leave for
The twin towers fell down. It looked_____ a huge piece of chocolate had been melted down(溶化).
| A．as though | B．even though | C．in case | D．if |
The money is to be used________the poor.
| A．for the benefit to | B．for the benefit of |
| C．for benefit of | D．to the benefit of |
The traditional view is _______ we sleep because our brain is “programmed” to make us do so.
| A．when | B．why | C．whether | D．that |