There is still a long way to go to work out all the problems the conservation of naturalresources. [ ]

He deserves to gain a high score in the coming exam, as he _________ preparations for it

His mother gets up at 6：00 a. m. every day. She is used to ____ early to make breakfast for the family.

Mr. Smith has taught for many years and he teaches well. All the students ______ him.

9,500 drivers sincethe beginning of the year, 23% were found lacking roadknowledge.