Holiday is ______ time for leisure. But making good use of ______ time is not an easy task for most people.

A. the; the     B. a; the         C.the; a    D.不填; 不填

We can never expect      bluer sky unless we create      less polluted world.

A．a; a              B．a; the             C．the; a            D．the; the

--- Haven’t you heard the news?

--- What news?

--- Some of the workers are on ____ march while others are on ____ strike.

A. /; the                       B. the; /                       C. /; /         D. the; the

- Of the two bags, which one do you prefer?

-__________bigger one. It's_______ most beautiful one, I think.

A. The; a                     B. The; the

C. A; /                       D. A; the

In most western countries, on April Fool’s Day，people often play _____  trick on each other; children especially have great  _______  fun.

A．a；a             B．the；the          C．不填；a          D．a；不填