Canada’s economic wealth is closely linked to _______ of the US, which buys three-quarters of its exports.

The two runners are neck and neck; _______ of themcould win the race

Thank you for your birthday gift. In fact, you couldn’t have chosen _________ for me. – I’m glad you like it.

What a pity! I missed meeting my boss atthe airport because my caron the way..

The race to seek out civilizations around distant stars ________, as an international group discovered an Earth-like planet in a special zone.[ ]