He found________ almost impossible to express what he wanted to say.

I thought I had made a good preparation.—You are dreamingThe fact is that you at the beginning.[ ]

_________ caused the accident is still a mystery.

Surprisingly, ____two thirds of the nation voted for his coming to power at a time when the two countries were at war.

I am going to Sanya with my parents this summer vacation.—— ____!