______ most of us considered solving the problem as soon as possible, he considered it of no importance．
| A．When | B．While | C．If | D．As |
from the top of the tower ,the south foot of the mountain is a sea of trees.
| A．Seen | B．Seeing | C．Having seen | D．To see |
—I wonder why Susan looks worried today.
—I’m not sure, but she _____a small accident driving here.
| A．could have | B．might have | C．might have had | D．must have had |
The job requireddid itcareful and brave enough.
| A．who; is | B．whom; was | C．whomever; were | D．whoever; be |
Is this the very material that scientists ______ the 2012 London Olympic Games torch?
| A．used to light | B．are used to lighting |
| C．use to light | D．are used to light |
My desk-mate, Beth comes from a traditionpeople dress up for particularly popular sporting events.
| A．when | B．where | C．how | D．why |