As director of the company, I can’t _____ three weeks from work.
| A．carry | B．cost | C．pay | D．afford |
We cannot figure out _______ quite a number of insects, birds, and animals are dying out.
| A．that | B．as | C．why | D．when |
Is this the reason _______ at the meeting for his carelessness in his work?
| A．he explained |
| B．what he explained |
| C．how he explained |
| D．why he explained |
_______ puzzles me most is that I don’t know _______ the difference between those two lies.
| A．What; that | B．It; that | C．What; where | D．It; where |
In our classroom, the pupils work in groups, _______ helps them to learn to co-operate, to share and to develop leadership skill.
| A．which | B．that | C．who | D．what |
We agreed to accept _______ they thought was the best professor in the college.
| A．whatever | B．whomever | C．whichever | D．whoever |