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