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Present perfect
We should help save the sharks.
Modal verbs
I. 用所给词的适当形式填空。
1. The old man used _____ (be) a teacher.
2. We should _____ (clean) the room every day.
3. Look! Tom _________ (sleep) in his room.
4. Lots of trees __________ (plant) on the hill every year.
5. He _________ (live) here for 20 years.
to be
clean
is sleeping
are planted
has lived
1. He promised to pick me up at the school gate.
However, he _____ yet.
A. didn’t arrive B. doesn’t arrive
C. isn’t arriving D. hasn’t arrived
2. Ba Jin, one of the greatest writers in China, ___ as “People’s Writer”.
? A. is regarded?? B. has regarded ??
C. is regarding?? D. regards
3. —At present, one of the best ways to study is
working in groups.
—More chances ______ to students to learn from
each other.
A. offer B. are offered
C. have offered D. are offering
The teacher used to be handsome,but now he is embarrassed.
The river is badlly polluted.The river used to be so clean.peple throw rubbish into the river.
we should pick up the rubbish.