The drilling in Antarctica dragged on slowly because of lack of money, equipment breakdowns, environmental ______ and severe cold.
“We’ll make public schools __________ can be,” said the President in the speech.
–Have you thought of a topic for your article yet? –No, I _____ a lot about it, but I haven't decided.
My command of English is not _____ yours.
–What can I do for you? –I'd like to buy a bicycle for my son, _____ at a proper price but of great use.
The place ____ the bridge is supposed to be built should be _____ the cross-river traffic is the heaviest.