Please send ______ my best wishes when you go to visit your grandparents.

Could you please ________ the window? It’s cold outside.—Oh, I’m sorry.

hat do you think of genetically modified food (转基因食品)? —We all think ______ is careless ______ some scientists to say it is safe before doing any experiment.

Where is your mother?— She _______ to Sichuan on business. She has ______ there four times recently.

I have to go to bed ____ 9 o’clock.[ ]