What an accident! If the driver_________ carefully, things would not be as they are

ys followed the marks that they ______, until finally they found their way back to the campsite.

Lisa has made great progress these days.–________, and ________.

The course that Beijing University offers normally attracts 30 foreign students per year; _______ up to half will be from America.

They discussed ________ they could settlethe problem without others’ help.