— I phoned you at 7 yesterday evening but nobody answered.
— Oh, I ________ my dog in the park then.
| A．walked | B．was walking | C．had walked | D．would walk |
There were two boys in the lab, _______ did the experiment successfully.
| A．the clever of whom | B．the cleverer of whom |
| C．the cleverer of them | D．the more clever of them |
Every boy and every girl as well as some teachers who_____ to visit the museum______ asked to be at the school gate before 6 :00 in the morning.
| A．are ; are | B．is; is | C．is ;are | D．are ;is |
__________both sides accept the agreement will a lasting peace be established in this region.
| A．If only | B．Only if | C．unless | D．As long as |
The time he has devoted in the past years _______ the disabled is now considered ________ of great value.
| A．to help; being | B．to helping; to be | C．to help; to be | D．to helping; being |
As ________ rule, apples are sold by ______ weight and eggs by _______dozen.
| A．a; 不填；the | B．a; the; the | C．a; a; the | D．the; 不填；不填 |