用括号内所给单词的适当形式填空。（5分）
1. A balanced diet can help us keep__________. (health)
2. School is over. Some students are busy __________the floor, (sweep)
3. The Greens live on the __________ floor in this tall building, (six)
4. Look! The boys and girls are playing games __________. (happy)
5. Many kinds of__________ are on show in Changchun Park every year. (flower)

There is __________backpack on the desk. It belongs to Tom.

A．a

B．an

C．the

D．/

You are old enough to make decisions by __________.

A．himself

B．herself

C．yourself

D．myself

Jack will have a math test this afternoon. He needs a__________.

A．hat

B．ruler

C．radio

D．camera

—What a beautiful key ring! __________is it?
—Only 5 yuan.

A．How old

B．How far

C．How long

D．How much

At present, the students in China take more exercise. Most of them are ______ than before.

A．strong

B．stronger

C．strongest

D．the strongest

—Look at the man in the classroom! Is he Mr. White?
—No, it __________be him. He's eating in the dining hall.

A．can't

B．mustn't

C．may not

D．needn't

—How are the dishes in the new restaurant, Sarah?
—They are__________. I want to go there again.

A．awful

B．salty

C．expensive

D．delicious

Vicky likes the book __________she borrowed from Jim.

A．who

B．that

C．whom

D．whose

Internet is very useful. It can __________our eyes to the outside.

A．put up

B．grow up

C．turn up

D．open up