People are destroying their best fighters ________ pollution．

A．against

B．by

C．for

D．in

Trees take ________ from the air, and release ________ into the air．

A．harmful gas; oxygen

B．oxygen; harmful gas

C．harmful oxygen; gas

D．oxygen; oxygen

It is said that the earth is ________ if human beings don't protect it．

A．in a danger

B．in dangerous

C．danger

D．in danger

Trees are ________ air conditioners．

A．nature

B．nation

C．natural

D．national

Why you are so ________ in Maths, Judy?

A．interested

B．interesting

C．interest

D．good

Trees make streets more beautiful and ________．

A．noisy

B．less noisy

C．noisily

D．more noisily

The index page of a book usually comes ________．

A．at the end of a book

B．in the middle of a book

C．at the beginning of a book

D．at the bottom of each page

John always ________ to school late．

A．come

B．coming

C．comes

D．has come

Don't make your parents ________．To be a good boy．

A．angry

B．angrily

C．happy

D．happily

The dish tastes ________．It is cooked ________．

A．good; good

B．well; well

C．good; well

D．well; good