It was _______ the exam results were known _______ a lot of time on computer games.
| A．not until; did the boy begin to regret having wasted |
B．until; that the boy began  to regret to have wasted |
| C．not until; that the boy began to regret wasting |
| D．until; did the boy begin to regret to waste |
The places of interest in Xi’an attract my family all the time, and I hope we _____ ourselves this time next year.
| A．are enjoying | B．are to enjoy | C．will enjoy | D．will be enjoying |
We should consider what use can _____ such a piece of cloth.
| A．make of | B．make use of |
| C．be making of | D．be made of |
I really don’t know _____ I put my wallet after I paid the bill.
| A．where was it | B．it was where that |
| C．where it was that | D．where was it that. |
People working 10 or 11 hours a day are more likely to suffer from health problems than _____who go off duty after eight hours.
| A．those | B．that | C．these | D．them |
I should convey my appreciation to my high school teachers, without ____ help I wouldn’t achieve such a big success.
| A．whom | B．them | C．which | D．whose |