20.C
21.C
22. C
23. B
24.A
25.D
26.A
27.B
28.A
29.C
30.D
31.A
32.C
33.My father hasn’t smoke for two years.
34.Getting access to the Internet is useful.
35.Both wine and cigarettes are bad for us.
36.Mount Everest is the highest mountain in the world.
37.I would rather stay at home than go out in this wet weather.
38.Unless someone puts the coal in, the fire will go out.
39.This was such expensive furniture that I didn’t buy it.
40.They won’t buy the new car until they save enough money.