He might have been killed in the car accident yesterday if he (take) ______ part in the activity with the team.
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Smith (pass)_________ the driver's test, but he wasn't calm enough in the last five minutes.
Li Ming speaks English in a way as if he (be) _________ an American.
If man (realized) __________ the importance to protect the environment, lots of forests would not have been cut off.
Why are you looking at me like this as if I had known it? In fact I (know) ___________ nothing about it.