16. When she was busy tidying the room, her little kid is always __________.
A. under way B. on the way C. in the way D. by the way
17. If you have trouble _____the poems, the notes on the margins will help you.
A. to understand B. understanding C. for understanding D. with understanding
18. I _______with all the windows closed, but now I‘d like some fresh air.
A. am used to sleep B. am used to sleeping C. used to sleeping D. used to sleep
19. It ________that the mysterious visitor was an old friend of my grandmother.
A. turned up B. turned off C. turned on D. turned out
20. Let‘s have a get-together on the weekend, ________?
A. shall we B. will we C. shan‘t we D. won’t we