—The government should try to balance economic growth and pollution from industry.—____. It’s time to do it.

Please remind me in case I ______ forget.

 —Mum, would you please buy me an MP5 player?—If you can help do the dishes the whole vacation, you ________ have one as a reward.

---I think her dress comes from the 1970s.---It _______be from that time. The dress looks so modern.

Johnny, you _________play with the knife, you_________ hurt yourself.