----Do you know_____ second-hand smoke? ----To prevent our health and memory.
The window was broken. Try to ________who has broken it.
Don’t forget to turn ________the lights when you leave the office.
She’s feeling ________ tired.
一 Would you like to see the film with me ? 一 Sorry.I ___________ it twice.
After discussing, the students some good ideas to work on the projects.