---- _____ does your school have the parents’ meeting ? ---- Twice a year.
He doesn’t do his homework___________, though he has ___________.
—_________ was light bulb invented ________ ? —Thomas Edison.
Some students enjoy raising pet dogs while_ _ don't agree with them.
The twins have tried, but _ _ of them has got the chance to study abroad.
I think the skirt on the desk can't be Lucy's. _ is made of- wool.