It is often recommended that children ________chances to get close to nature.
| A．are offered | B．be offered | C．should offer | D．must be offered |
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．after which | D．on which |
I have visited a lot of different places and stayed in lots of different hotels, but none of them _____ this one.
| A．makes | B．beats | C．compares | D．Matches |
—Why does the lake smell terrible?
—Because large quantities of water______.
| A．have polluted | B．is being polluted |
| C．has been polluted | D．have been polluted |
—We had ______ really damp October this year.
—I can’t remember ______ autumn when it rained so much.
| A．a; 不填 | B．不填; the | C．the; an | D．a; an |
If you find yourself ______ no one will help you, please call me.
| A．where | B．when | C．which | D．what |