I meant to help him . ______， he didn’t accept my offer.
| A．But | B．As a result | C．Therefore | D．However |
There is a common belief among them _______ rubbish can and should be put into good use.
| A．which | B．if | C．whether | D．that |
We never doubt ______ our school team will win the match against No. 3 Middle School.
| A．whether | B．that | C．if | D．what |
The teacher usually grades the students on _______ they have behaved.
| A．that | B．what | C．which | D．how |
Once _____, it won’t be easily forgotten.
| A．saw | B．seeing | C．seen | D．see |
_______ David says sound right to Helen. That’s why he has made up her mind to leave the matter to him _______ happens.
| A．Whatever; whatever | B．No matter what; whatever |
| C．No matter what; no matter what | D．However; no matter what |