John took part in the games, but the rest of us just .
| A．looked up | B．looked on | C．looked out | D．looked over |
The conservation area is very important for preserving many animals and plants, which would ______ run the risk of becoming extinct.
| A．otherwise | B．therefore | C．though | D．instead |
______ we think of Ben, we have to admit that he is a highly competent man.
| A．However | B．Whether | C．Whichever | D．Whatever |
Lin Tao has returned from the UK recently. He ______ at Cambridge for four years, during which we ______ with each other on the Internet.
| A．has studied; has communicated | B．had studied; communicated |
| C．studied; had communicated | D．studied; communicated |
Generally my father is a mild man, but when he gets angry, he ______ be fierce.
| A．can | B．should | C．must | D．shall |
All our efforts will be made to create _______ more peaceful and more advanced world, ______ place where everyone enjoys his life and freedom.
| A．/; the | B．a; a | C．the; a | D．a; the |