——How much is it ______? ——$ 20, I think.
---Xiao Ming, will you take part in the coming National English Speech Contest? ---______, we should catch the precious opportunity.
Mr. Luke, in ______ supermarket we bought an i-Pad last week, will give us a report on how to choose a career this evening.
My doctor advised me to reduce the amount of sugar ______ to the milk I drink.
---I haven’t got the reference book yet, but I’ll have a test on the subject next month.---Don’t worry. You ______ have it by Tuesday.
---What’s that unpleasant noise?---Oh, the road before the main gate ______.