--What’s the problem with the car? Have you checked the engine?--Yes, I did twice; there _________ be anything wrong with the engine.
We agreed to accepted ______ they thought was the best tourist guide.
You may______remember some idioms in the texts but you couldn’t ______ remember all the words in them.
Why! I have nothing to confess. ______ you want me to say?
The best method to ______ this goal is to unite as many people as possible.
Scientists say it may be five or six years _____ it is possible to test this medicine on human patients.