---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 |
________ if you want to do something, or you won’t be able to do it well.
| A．To try your best | B．Trying you best | C．Try your best | D．Unless you try your best |
Plants grow best _____ it is warm and wet .
A where B which C in which D that
--- Father, I’m going out for a play.
---- _________ be long!
| A．Don’t | B．It won’t | C．Won’t | D．You didn’t |
_______ your mind and you will find the way.
| A．Using | B．Use | C．If you use | D．To use |
My brother is always making good use of the time _______ he can spare.
| A．when | B．in which | C．while | D．that |