It is difficult __________ a best friend.
| A．finding |
| B．found |
| C．to find |
| D．find |
As rainforests are being _______, the environment pollution is becoming more and more serious.
| A．cut off | B．cut down | C．cut in | D．cut up |
Recently I bought an ancient Chinese vase, _____ was very reasonable.
| A．which price | B．the price of which | C．its price | D．the price of whose |
With all the passengers ________, the plane took off.
| A．on the board | B．on board | C．on the boards | D．on boards |
He talked happily about the teachers and books _______ interested him greatly in the school.
| A．that | B．when | C．who | D．which |
Every one of the girls was looking forward to _______ as an actress.
| A．be chosen | B．choosing | C．being chosen | D．choose |