Researchers have found clear and convincing evidence ________ happiness isthe key to better health and longer lives.

Would you mind _______ the window ? –No, not at all .Do please .[

Tim plays computer games too much. — That’s why his mother __________ his eyesight.[ ]

Ask them their names and ____________,please. — OK. Mr. Zhang. I’ll do it right now.

I don’t think it is ______ good idea to go to school without ______ breakfast.