I.1a away
2a dissolve
3d to seeing
4a because
5b as
6c air pollution
7c who
8a funnel-shaped
II.9 have
10 visiting
11 is spoken
12 worked
III.18 No,it isn't
19 Natural gas used for heating homes and cooking
20 Natural gas is used chiefly as a direct source of energy
21 it comes from all over the country from the gas fields below the North sea
22 It will run out during the 21st century
IV 13F
14F
15T
16F
17T
V 23 I wish I could speak Spanish
24 Mr Robinson,who wants to save money for a new house, works very hard
25 If I weren't very busy, I could go with you
26 Tom isn't tall enough to reach that picture on the wall
27 Miss Lan apologized for being late
28 what bout going to the cinema?
VI. 29 farmers protect the land to change their crops year to year
30 The buses are usually stopped before midnight
