---How can we reduce CO2 in our home?
---It’s easy． off your TV or computers when you’re not using them, and you’ll greatly reduce it．
| A．Turn | B．To turn | C．Turning | D．Turned |
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 |
We won’t give up ________ we should fail ten times.
| A．even if | B．unless | C．whether | D．Until |