I don't think you ___(pass)the final exam since you ___(not work) hard.I don't know when ___(leave).The birds___(let) to fly away a moment ago.Helen is interested in _____(study) birds.On May 12,2008,a strong earthquake ____(hit) Sichuan,it killed ma

I don't think you ___(pass)the final exam since you ___(not work) hard.I don't know when ___(leave).The birds___(let) to fly away a moment ago.Helen is interested in _____(study) birds.On May 12,2008,a strong earthquake ____(hit) Sichuan,it killed ma
I don't think you ___(pass)the final exam since you ___(not work) hard.
I don't know when ___(leave).
The birds___(let) to fly away a moment ago.
Helen is interested in _____(study) birds.
On May 12,2008,a strong earthquake ____(hit) Sichuan,it killed many people.

I don't think you ___(pass)the final exam since you ___(not work) hard.I don't know when ___(leave).The birds___(let) to fly away a moment ago.Helen is interested in _____(study) birds.On May 12,2008,a strong earthquake ____(hit) Sichuan,it killed ma
have past (since 判断是现在完成时）
leaves（从句时态保持不变）
let (let的过去式let)
studying（介词in后动词加ing)
hit (hit的过去式）

I don't think you __can pass_(pass)the final exam since you _haven't worked_(not work) hard.
I don't know when _to leave__(leave).
The birds__are let_(let) to fly away a moment ago.
Helen ...

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I don't think you __can pass_(pass)the final exam since you _haven't worked_(not work) hard.
I don't know when _to leave__(leave).
The birds__are let_(let) to fly away a moment ago.
Helen is interested in _studying____(study) birds.
On May 12,2008,a strong earthquake __hit__(hit) Sichuan,it killed many people.
不懂就要问，但是不能照抄答案。

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I don't think you would pass the final exam since you didn't work hard.
I don't know when to leave.
The birds were let to fly away away a moment ago.
Helen is interested in studying birds.
On May 12, 2008, a strong earthquake hit Sichuan, it killed many people.

1.pass ; have not worked
2.were let
3.studying
4.hit