—Does David often come to school ____ bus?—Yes, but sometimes he comes ____ his father’s car.
Smoking is so harmful to people’s health that it kills __________ people each year than automobile accidents.
I’ll come to pay a visit to you if _______ this weekend.
The student was ________ a gold cup for his excellent performance in the competition.
Tom ____ be ill, for I saw him playing basketball an hour ago.
It doesn’t _____ to set off fireworks on holidays since the smog(雾霾) is so severe at present.