Somemoleculesarelargeenough________(see)undertheelectronicmicroscope.
Thosewho’dliketovisittheexhibition________(sign)yournameshere.
Iwonderifhecouldgetit________(do)beforetomorrow.
Ishallneverforget________(meet)thelatePremierZhouduringhisinspectionofourfactory.
Hefellasleepimmediatelylastnight;hemust________(be)verytired.
________(fail)severaltimes,theyneedsomeencouragement.
