16 B
17 A
18 C
19 C
20 D
III
1 C
2 B
3 C
4 C
5 C
6 B
7 C
8 C
9 A
10 A
IV
1 Because the world is getting warmer, polar bears are in danger of .....
2 As there weren't enough students, they closed the village school
3 Although the music was too loud, I really enjoyed....
4 When he got a cream pie smashed in his face, eeryone laughed
5 While Paul was walking to the bus stop, he found somebody's wallet on the ground
6 After Jackie is done with her chores, she will take out the trash
7 If you study for the test, you will do much better
8 Rex practiced his guitar until he could play the song perfectly