Itisnecessarythatthestudents____moreexcercisestodo.
Dr.Yangworked______threedaysago.
Idon’thaveas______moneyasbefore,butmylifeismore______.
The____ofAIDShasledtoanexpansioninresearchseekingacure.
Thankyouforyourhelp,_____wecouldnothavefinishedtheworkintime.
