. In my opinion, you can widen the _____ of these improvements through your active participation.
—The research on the new flu virus vaccine is challenging and demanding.Who do you think can do the job?—________ my students have a try?
—Mum, can I watch the TV program for another twenty minutes?—Sorry, dear, it's time you ________ to bed.
________ him not to do so, he wouldn't have made such a serious mistake.
—Look at the full moon. How beautiful it is!—How I wish I ________ on it some day!
The school recommends parents ________ their children to swim in rivers or lakes during summer holidays.