There must be ________ in this wood．

A．else something

B．anything else

C．something else

D．else anything

Trees live ________ than people．

A．long

B．much long

C．much longer

D．more longer

One and a half hectares of trees could produce enough oxygen to keep your whole class ________ for a year．

A．live and health

B．alive and healthy

C．alive and healthy

D．live and healthy

People are destroying their best fighters ________ pollution．

A．for

B．by

C．against

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 are you 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

选择并抄写单词。

Can anything ________ a mother's love and care?(place, replace)