Before selecting the curtain for your newly decorated house, it's important to know what colors look great ________ the wallpaper.

Like some of my classmates，I cannot live up to my teachers' expectations；________，I let them down.

A friend of mine will go to France________Hong Kong，and we agree to contact each other________email.

Many chemical substances react________oxygen.

They are quite different ________ each other ________their tastes.

Isn't ________ rude ________ him to talk to his mother like that?

—How do you react ________your father's suggestion?
—I reacted strongly ________it.

—I want to know how you react ________ my lecture.
—On the whole, it's very excellent, but I react strongly
　________the thoughts on human nature.

The dog was approaching ________the garden when she ran out.

They have lived in this village________several years ago.