3 . Many lessons are now available online, from ___________students can choose for free. (用适当的词填空)

4 . John invited about 40 people to his wedding, most of ________ were family members. (用适当的词填空)

5 . Scientists have advanced many theories about why human beings cry, none of ______ has been proved. (用适当的词填空)

6 . The number of smokers, _________ is reported, has dropped by 17 percent in just one year. （用适当的词填空）

7 . He may win the competition, in ________ case he is likely to get into the national team. (用适当的词填空)

8 . Last winter, part of Britain was struck by snowstorms, from ________ effects most passengers in Heathrow were suffering a lot, especially those with children.

A．which

B．what

C．whose

D．that

9 . （2017新课标III卷）But Sarah, ___________has taken part in shows along with top models, wants to prove that she has brains as well as beauty. (用适当的词填空)

10 . Kate, ________ sister I shared a room with when we were at college, has gone to work in Australia. （用适当的词填空）