25. ---You ____ him more help, even though you were very busy.
---Well, now I regret not.
| A．might have given | B．may give |
| C．must have given | D．should give |
The money collected should be made good use __________ the people who suffered a lot in the terrible flood in Beijing on the night of July 21, 2012, which caused great losses．
| A．of helping | B．to help | C．of to help | D．to helping |
I am sorry you’ve been waiting so long, but it will still be some time __________ Brain gets back from his holiday.
| A．since | B．before | C．till | D．after |
— Can you explain ____ you have been late for school several times this term?
— Sorry, but it is the first time that I have been late this week.
| A．why is it that | B．how it is that | C．why it is that | D．how is it that |
________ of you figures out the answer will be given a pack of candies weighting 2 pounds as a gift.
| A．Anyone | B．Whoever | C．Those | D．Who |
After _________ all the difficulties, he has developed a habit of facing everything bravely, and is now living a simple but full life.
| A．looking through | B．going through | C．looking up | D．going up |