you may have , you should gather your courage to face the challenge .
| A．However serious a problem |
| B．Whatever serious a problem |
| C．However a serious problem |
| D．No matter how a serious problem |
If I remember correctly， _______was ten years ago that your brother went to Canada.
| A．this | B．which | C．as | D．it |
——Did you stay up very late last night?
——No，It was not 10 o’clock yet ____I went to bed.
| A．when | B．until | C．that | D．while |
In Dali Mr Green was so struck by the beauty of _____nature that he stayed for _____third week.
| A．the ; the | B．the ; a | C．不填；the | D．不填；a |
----We could have come here much earlier in your car.
----I agree. But it _____.
| A．is repaired | B．was being repaired |
| C．had been repaired | D．is being repaired |
He was willing to help me ,and expected nothing________ .
| A．In addition | B．In return | C．By chance | D．By turns |