--Will you go to Tina’s birthday party?--No. ______ invited, I can’t go. I’ll be very busy then.
Young students are______ not to smoke both in and out of school.
--- Beautiful day, isn’t it? Shall we go out for a picnic? --- ______________!
It’s _____ you do today that will make a difference in your life tomorrow.
Mr. Green showed his students some photos ________ at World Expo 2010 Shanghai.
A group of children are looking into the box, ____ about what can be inside.