The _____look on Sam’s face suggested that there must have been something _____ on his way to school.
People who have regular physical exercise seldom catch a disease like H1N1 Flu, ______?
-----The windows must have taken you quite a long time that day. ------Right. They for weeks.
The Chinese language _______ many western languages _______ it uses characters which have meanings and can stand alone as words.
Many people in the city wonder _____the city officials have the information they need to solve the problem.
I ______ him in time, otherwise he would have fallen off the bike.