----_____do you improve your listening?
----I improve it ______ listening to tapes.
A. How; with B: What; with C: How; by D. What; by
Has everything _____ can be done ______?
| A．what; done | B．that; been done |
| C．that; already done | D．what; already being done |
Is this the watch you wish to _____?
| A．have it repaired | B．repair it |
| C．have repaired it | D．have repaired |
These are questions ______ by history.
| A．left over | B．left off | C．leaving out | D．leaving behind |
___that she’s by law old enough to get married, I don’t see how you can stop her.
| A．Having seen | B．To see | C．Seeing | D．Seen |
He bought some books, ______ were expensive.
| A．most of which | B．the most of which |
| C．most | D．the most of that |