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?

toworkon,butIgotsotiredthatIcouldnolonger________.

_______ review of 44 studies, American researchers found thatmen and women who ate six key foods daily cut the risk of __________ heart diseaseby 76%

Tom, you ever that new film—Yes. I it a week ago.

Maggie’s house is next to mine. We see each other _________.