单选题 He works in our university as(　　)visiting _______, not as(　　)formal faculty member.

单选题 With the help of the government,(　　)large number of people ---_______ after the flood in 1991.

单选题 This river is so big that it is impossible to build(　　)_______ under it without modern technology.

单选题 The _______ work continued for more than(　　)week but there was still no sign of the missing boy.

单选题 We do not have(　　)_______ school in our institute. The highest degree we provide for the students is(　　)B.A. and(　　)B.S..

单选题 When(　　)spacecraft travels, one of the major problems is reentry into the Earth’s _______.

单选题 She is already 16years old. But she _______as if she were still(　　)little girl.

单选题 This river forms(　　)natural _______ between China and Korea.