6．
(1) Even small improvements can make a great difference ________.
(2) When winter arrived, the kids________ go skiing.
(3) ________I have made this first visit, I hope I can come many more times.
(4) The college years ________ be a time for important growth in dependence.
(5) Our class ________ the idea to make better use of used materials.
(6) --I’ll talk to my son Bill about it as soon as possible. He always listens.
-- We need ________ listening. We need action.
(7) Many famous actors keep fit by ________in the gym every day.
(8) Wang Bin’s parents ________ him, demanding that he should only do the reading instead of surfing the Internet even in summer holiday.
(9) The company won the contract(合同）by saying it would do the job ________.
(10) I ________ all night preparing for my history exam.