Thosewho’dliketovisittheexhibition________(sign)yournameshere.
Thefloordoesnotlooksobadwhen________(sweep)clean.
Hefellasleepimmediatelylastnight;hemust________(be)verytired.
Tosucceedinascientificresearchproject________.
Somemoleculesarelargeenough________(see)undertheelectronicmicroscope.
The more we looked at the picture, ________.
