She always come to our help when we get into trouble ____ she is very busy.
| A．since | B．once |
| C．even if | D．so that |
It is no ________ pretending you did not know because everyone saw the whole accident.
| A．use | B．help | C．time | D．joke |
—He has a lot of friends who have a lot in ________ common with himself.
—Indeed.Birds of ________ feather flock together.
| A．the; / | B．the; a | C．/; a | D．a; the |
Finding information in today's world is easy.The ________ is how you can tell if the information you get is useful or not.
| A．knowledge | B．ability |
| C．competition | D．challenge |
Friendship is both ________ source of pleasure and ________ component of good health.
| A．a; a | B．/; / | C．the; a | D．a; the |
As ______ mountains surrounding our village are turning much greener, they have become ________ home to a large number of wild animals.
| A．the; / | B．the; a | C．/; a | D．the; the |