I have a fear of heights , but that won’t stop me from ___ a pilot .
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.