The best thing to start one's breathing is ________the mouth-to-mouth way.

[    ]

A. use   B. uses   C. to use   D. used

Parents shouldn't let young children get close to pools and rivers____ themselves.

[    ]

A. on   B. by   C. with   D. /

Since many common injures happen in the home, all parents ________know some first aid.

[    ]

A. may   B. can   C. ought   D. should

If you want to do first aid correctly, you have to study _______ a teacher.

[    ]

A. with   B. to   C. for   D. of

He could earn enough ________ a family of four.

[    ]

A. support   B. supports   C. supporting   D. to support

They were tired and couldn't walk ______.

[    ]

A. enough fast  B. fast enough  C. enough fastly  D. fastly enough

— Look, someone is coming. It may be the headmaster.

 — It _______ be him. He went to Shanghai yesterday.

[    ]

A. may not   B. needn't   C. shouldn't   D. can't

I can't use my bike because it_______________.

[    ]

A. is repairing B. is being repaired

C. will repair  D. was repairing

It's the third time you ______ late this week.

[    ]

A. had arrived  B. arrived  C. have arrived  D. arrive

Man _______fighting a battle against pollution.

[    ]

A. is   B. are   C. has   D. have