Canada's economic wealth is closely linked to _______ of the US, which buys three-quarters of its exports.
—Does Bill do his new job well? —____ his old job. I’m afraid there’s no hope for him.
____ our teacher will allow ____ early after examination?
Not until the heavy snow blocked the express ____ how serious the weather was.
—Where did you see your friend? —It was in the super market ____ I was doing shopping.
Grandma will appreciate ____ if her elder sister could come back from abroad.