——Is there any possible way to help them get rid of such a bad habit? ——To tell the truth, it’s very hard. But we_______ on this problem.
Only after you have known someone for some time _____to appreciate his real worth.
----How useful do you think the Internet is as a_____ of information? ----I think it is fairly useful, but a lot of the information you find online is false.
.----The research on the news bird flu virus vaccine is challenging and demanding.Who do you think can do the job? ----____ my students have a go ?
----Why were so many people trapped into buying the stock of the company? ----______enough money within one night .
It is global warming, rather than other factors, _____the extreme weather.