Our teacher is always busy preparing lessons
until 11 o’clock at night, we students have gone to sleep.
| A．that time | B．by which time |
| C．by that time | D．which time |
The Expo site should be _______ from anywhere in the city of Shanghai within 90 minutes by bus, subways and special taxis.
| A．adoptable | B．acceptable | C．available | D．accessible |
The doctor said jokingly that his own infection of the virus _______ the discovery of a vaccine (疫苗)of the disease.
| A．stood for | B．called for | C．paid for | D．contributed to |
-- Jimmy had a lot of parties recently.
-- Yes, that might ______ why he didn’t do well on the test.
| A．sum up | B．push for | C．account for | D．compensate for |
In order to work better in the future, each of us must first of all know our ______ and weaknesses.
| A．strengths | B．benefits | C．techniques | D．values |
31. The engine of the bus was out of order and the bad weather ______ the worries of the passengers.
| A．added up | B．added to | C．resulted from | D．made of |