I don't skate now, but I___________ when I was a kid.
We don’t believe the reason _________ he gave for his being absent from school.
---- Look! Everything here is under construction. ---- What’s the pretty small house that ____________ for?
---- Isitinthatfactory__________“RedFlag”carsareproduced? ---- No, they are produced in our factory.
We’retalkingaboutthepianoandthepianist_____wereintheconcertweattendedyesterday.
Thefreezingpointisthetemperature__________waterchangesintoice.