Most experts agree that human activities such as the clearing of large areas of forests, and farming on a large scale _________ the problem of global warming.
| A．is leading to | B．is resulting in | C．are contributing to | D．are owing to |
He particularly enjoyed __________ a trick on the three men.
| A．play | B．played |
| C．playing | D．to play |
—Did you enjoy yourself last night?
—Yes, it's very nice of you. I appreciated __________ to the party.
| A．to be invited | B．to have invited |
| C．having been invited | D．having invited |
The man insisted __________ a taxi for me even though I told him I lived nearby.
| A．find | B．to find |
| C．on finding | D．in finding |
Isn't it time you got down to __________ the papers?
| A．mark | B．be marked |
| C．being marked | D．marking |
In some parts of London, missing a bus means __________ for another hour.
| A．waiting | B．to wait |
| C．wait | D．to be waiting |