Tom is a 12-year-old boy. If he has a headache, he should take __________ a day.

A．tablet	B．1 tablet
C．2 tablets	D．3 tablets

The Public Library is closed at __________.

A．5:00 p.m.	B．9:00 a.m.
C．4:00 p.m.	D．12:00 a.m.

Lin and his father want to go to the Hamilton Zoo, they should pay __________.

A．$ 15	B．$ 30
C．$ 45	D．$ 10