_________they grow they make sure that what is left in the ground after harvesting_________a natural fertilizer for the next year’s crop.

Doug, where is your coach, Chow?—See, he ______ by a group of journalists

24.—John, don’t waste any time and there’s only 25 minutes left before the train leaves. —Don’t worry , mum. I think I can ____it.

ou’ve got a "D" in chemistry．____—Well, I findthe subject hard and I think I’ll drop it for history next term．

On the graduation day, he received from his father a nice present ______ a note was attached, saying “I’m proud of you.”