The time he has devoted in the past years _______ the homeless is now considered _________ of great value.
| A．to help; being | B．to helping; to be | C．to help; to be | D．helping; being |
China's population is expected to increase to about 1.5 billion in 2040, ______it will start to decline slowly.
| A．where | B．which | C．on which | D．after which |
Catching _____ sight of their head teacher coming, the students fell into silence all of _____ sudden.
| A．the; the | B．/; a | C．the; a | D．/; / |
—How do you find the film Captain America: The Winter Soldier?
—___________. The film is well worth seeing.
| A．It makes no sense | B．Oh, wonderful indeed |
| C．By chance | D．It all depends |
While in London, we paid a visit to the hospital founded ______ the nurse Florence Nightingale.
| A．in memory of | B．in place of | C．in search of | D．in charge of |
Doctor Smith has made another wonderful discovery, _______ great importance.
| A．which I think is of | B．which I think it is of |
| C．which is I think | D．I think which is |