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3. Someone _________ at the door. Can you
open it?? (2014 河北)
A.?knocks ? ? ? ? ? ? B. knocked
C. is knocking ? ? ? ? ? ? ? D. was knocking
4. Children _________ sit in the front seat
of a car. It’s too dangerous. ? (2014 重庆)
A.?need ? B. needn’t ?
C. must?? ? D. mustn’t
5. She used to ______ a bus to school, but now she is used to ______ to school.
A. taking; walk
B. take; walk
C. taking; walking
D. take; walking
(2014 四川南充)
The earth is polluted.
air pollution
The factories that
burn coal pollute
the air with a lot of
black smoke.
n. 煤炭
Factories put waste into the river.
water pollution
mobile phone pollution
litter v. 乱扔
n. 垃圾
rubbish waste
垃圾,废弃物
People should throw away litter in the bin.
n. 垃圾箱