Edward, you play so well. But I you played the piano.
| A．didn’t know | B．hadn’t known |
| C．don’t know | D．haven’t known |
Now that the children have___, we should let them free to choose their style of living.
| A．picked up | B．brought up | C．grown up | D．taken up |
Our duty is to ______ their country against both domestic and foreign enemies’ attack.
| A．delay | B． defend | C．defeat | D．depend |
－Bob failed in the exam again.
－He ________ it；he never worked hard.
| A．deserved | B．succeeded | C．missed | D．considered |
______ people are standing outside the office. _____ people there is at least over 1,000.
| A．A number of; A number of | B．The number of; The number of |
| C．A number of; The number of | D．The number of; A number of |
You should always _____ your conclusion _____ careful research.
| A．depend; on | B．base; on | C．put; into | D．base; by |