. Going out for tea with friends _increasingly popular during the past twenty years.
| A．becomes | B．became | C．has become | D．had become |
Key: C
42. Many countries are increasing their use of natural gas, wind and other forms of ________.
| A．energy | B．source | C．force | D．material |
41. —Well, it's getting late. I must be going. Thank you again for inviting me to the party.
—________
| A．Oh, it's already so late? |
| B．Thank you for coming. |
| C．Oh, sorry you could't come. |
| D．I really had a happy time. |
40. —Shall Tom go and play football?
—Not ________ he has finished his homework.
| A．when | B．if | C．unless | D．once |
39. Was ________ Bill, ________ played basketball very well, ________ helped you repair your bike?
| A．this; that; who | B．it; that; it |
| C．it; who; that | D．this; who; who |
38. —You've left the light on.
—Oh, ________. I'll go and turn it off.
| A．so do I | B．so I have |
| C．so have I | D．so I do |