How many liaisons of sound are there in the sentence "He bought an interesting book"?

The students in a certain physical education class are on either the basketball team or the tennis team, are on both these teams, or are not on either team. If 15 students are on the basketball team, 18 students are on the tennis team, 11 students are on both teams, and 14 students are not on either of these teams, how many students are in the class?

The students in a certain physical education class are on either the football team or the basketball team, are on both these teams, or are not on either team. If 12 students are on the football team, 15 students are on the basketball team, 8 students are on both teams, and 9 students are not on either of these teams, how many students are in the class?

There are many（）in China.

How many rooms are there altogether in the tower buildings?There are altogether ____ rooms.

How many categories are there in water transport?（）

How many morphemes are there in the word impassable?

Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

Why are many people on restricted or reduced diets?

How many（）are there altogether?

Compensated flow control or constant flow valves are used in hydraulic systems to（）

Under centrifugal pumps are the volute, diffuser, mixed-flow, axial flow and （） or regenerative types.