選擇合適的詞填空
from，to，of，in，by
（1）I want to go to school

by

by

bike．
（2）Smoke

from

from

cars makes the air dirty．
（3）There's some rubbish

in

in

the water．
（4）This is a picture

of

of

my family．
（5）We can walk to school

to

to

keep the air clean．