There are usually 28        in a person’s mouth, so we should listen to the doctor’s ______ to protect（保护）them.

 There ______ a knife and two forks on the table. 

The number of foreign students attending Chinese universities ______ rising steadily since 1990.

 Not only I but also Jane and Marry ______ tired of having one examination after another.

Jack with his two kids           to the beach for vacation every year.