【题目】It is necessary for us students _______________ the listening ability.

【题目】— There is ________ and the river runs too quickly for boats.

【题目】—I’m very busy because I am having the final exams this week.

【题目】—________ listen to music in the classroom.

【题目】—You ________. Don’t talk on the phone.

【题目】It usually takes him half an hour ________ the homework.

【题目】—Can you finish your math homework this afternoon?

【题目】It’s raining all day, so I ________ stay at home.

【题目】—___________can we become good learners?

【题目】—Why do you want Lisa to help at the old people’s home?