New light may be the cause of cancer by research that is now in progress．
| A．thrown | B．thrown off | C．thrown on | D．thrown by |
—I wonder why he has been acting so strangely these days.
—Recent pressure at work may his behavior.
| A．make for | B．stand for | C．change for | D．account for |
It was not rare(稀少) in that people in fifties were going to school for further study.
| A．90s; the | B．the 90s; / | C．90s; their | D．the 90s; their |
Mary speaks with a strong southern accent so that she is taking classes to herself of it.
| A．support | B．struggle | C．rid | D．equip |
Written in a hurry, . How can it be satisfactory?
| A．they found many mistakes in the report |
| B．Sam made lots of mistakes in the report |
| C．there are plenty of mistakes in the report |
| D．the report is full of mistakes |
The traffic problems we are looking forward to seeing should have attracted the government’s attention.
| A．solving | B．solve | C．to solve | D．solved |