E-mail, as well as telephones, an important part in daily communication.
| A．is playing | B．have played | C．was playing | D．play |
His efforts to raise money for his program were ______ because, no one showed any intention to take a cent out of their pockets.
| A．in place | B．in sight | C．in effect | D．in vain |
You’d sound a lot more polite if you make a request ______ a question. 
| A．in search of | B．in the form of |
C．in need of | D．in the direction of |
The questionnaire takes ______ ten to fifteen minutes to complete and can be used along with the assessment interview.
| A．mainly | B．punctually | C．approximately | D．precisely |
As there is less and less coal and oil, scientists are exploring new ways of making use of ______ energy, such as sunlight, wind and water for power and fuel.
| A．primary | B．alternative | C．instant | D．unique |
In our class, when the bell rang and the teacher closed his book, it was a ______ for everyone to stand up.
| A．signal | B．chance | C．mark | D．measure |