All 5 children of the Blacks, _______ are now working abroad, will come back for their parents’ 50th wedding anniversary.
| A．two of whom | B．two of them | C．both of whom | D．both of them |
The field research will take Joan and Paul about five months;it will be a long timewe meet them again.
| A． | after | B． | before |
| C． | since | D． | when |
John received an invitation to dinner,and with his work_____ ,he gladly accepted it.
| A．finished | B．finishing |
| C．having finished | D．was finished |
—Did Peter fix the computer himself?
—He _______,because he doesn’t know much about computers.
| A．has it fixed | B．had fixed it |
| C．had it fixed | D．fixed it |
Last week,only two people came to look at the house, ______wanted to buy it.
| A．none of them | B．both of them |
| C．none of whom | D．neither of whom |
You can only be sure of_____you have at present;you cannot be sure of something_____you might get in the future.（）
| A． | that;what | B． | what;/ |
| C． | which;that | D． | /;that |