Before I talked with ______scientist, I had never met_____ clever person like him.

I ______ him in time, otherwise he would have fallen off the bike

It was not until dark ______ he found that it was the correct way to solve the problem.

together with her parents, were into the deepforest in ______ search of rare plants when ______ three were exposed to a bigbear.

Why didn’t you tell me the news of the meeting–I knew nothing about it, or I _______ you.