— Do you agree that lions and tigers ______ the cat family?
— I have no idea.
| A.belong | B.are belonged to | C.are belonging to | D.belong to |
The Yangtze River, China’s longest, has been affected by a severe drought, ________ the lowest level of rainfall this year since 1961.
| A.with | B.for | C.beyond | D.besides[来 |
Professor Smith, along with his assistants, _________on the project day and night to meet the deadline.
| A.work | B.working | C.is working | D.are working |
There was so serious a matter that I had no choice but _________ the police.
| A.called in | B.calling on | C.call for | D.to call in |
The new research team was led by the ________engineer.
| A.main | B.major | C.chief | D.primary |
—Will you come?
—________you promise not to invite Mary.
| A.As if | B.If only | C.Only if | D.Even if |