_____ he still worked hard, _____ he was very tired.
Things made of plastic are usually _______, but they are _______ to get polluted.
All the club members _______ the floor when they heard someone _______ for help.
A fridge is used to keep food which goes _______ very _______.
—Our P.E. teacher isn’t as young as he _______, is he?—No, but he is one of _______ in our school.
There is _______ with your computer. Why not have it _______?