.It is very difficult to his mind because he is always changing his mind.
. No matter how great the difficulty is, it can’t _____the experts from finishing the project on time.
. Whenever you enter the reading room, you can find all the students _____ at their desks, with their attention _____ on the books, except Tom.
. The little boy was found_________in his room the next day.
. —What do you think of seven o’clock outside the cinema this evening? —That _______ me fine.
. He’s got himself into a dangerous situation ________ he is likely to lose control over the plane.