______ is know to us all, good friends ______ happiness and value to our life.
| A．It; add | B．As; add up | C．It; add up | D．As; add |
4. He is one of her many _______.
| A．admiration | B．admirer | C．admirers | D．Admirations |
5. Honest ________, though unpleasant to the ear, induces good conducts. (prov.)
| A．advices | B．proposal | C．advice | D．Suggestions |
6. We haven't seen each other for _______, though we are in the same city.
| A．eras | B．millennium | C．epoch | D．Ages |
7. Our older generation used to advise us not to build ____ in the air, but that’s not realistic at all.
| A．attics | B．castles | C．building | D．Rostrums |
8. Usually passengers are required to arrive at _____ one hour before ______ takes off.
| A．airport; aircrafts | B．the airport, aircraft |
| C．an airport, a aircraft | D．the airport, the aircraft |