This old professor insisted that he _____energetic enough and that he _____.
_____tohavelunchwithustoday?
Everyone_____dohisbesttomaketheworldsafeandclean.
Heaskedmeifhe_____openthewindow.
Sincetheroadiswetthismorning,_____lastnight.
IncaseI_____,Iwouldtryagain.