The number of students in our school _______ 4000 and a number of them ______ good at playing Ping-Pong.

Wehave to keep _______ with the changing times.

The success of a government should be in terms of the health and happiness of the people as well as the development of economy.

Mum, can you give me some advice on how to behave myself at the table— Well, I do have some advice. , please keep quiet while eating.

When and where _______ we meet—Let’s make it 3:00 at my home.