They ----------(look )at the blackboard,but they couldn't ------(see) anything .是不是looked,see?

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They ----------(look )at the blackboard,but they couldn't ------(see) anything .是不是looked,see?
They ----------(look )at the blackboard,but they couldn't ------(see) anything .
是不是looked,see?

They ----------(look )at the blackboard,but they couldn't ------(see) anything .是不是looked,see?
是,他们看了看黑板,但是什么也没看见.