You can never imagine what great difficulty I have _____ your house.
Most students prefer tests _____ have easy questions.
--There is no juice in the fridge, _____? --No, we’d better go and buy some.
Everyone of us _____ it’s important _____a seat belt in the car.
–The lights in the classroom are still on. --Sorry. I’ll go and ____.
–What do you do with your daughter while you are away? --Oh, she ___ by her grandparents.