Experiments of this kind ___in both the U.S and Europe well before the Second World War.
_____ impressed me was the boy’s ability to deal with this kind of difficult physics problem.
In no way should we hunt and kill antelopes. _____, everyone should make great efforts to protect them.
I saw Tom _____ into the classroom without _____.
Having been attacked by terrorists, _____.
You can’t predict everything. Often things don’t _____ as you expect.