The UN system is a major purchaser of goods and services ,_______over $4 billion a year .
_______ snacks and drinks, but they brought cards for entertainment when they had a picnic in South Bank Parklands.
It was about 600 years ago _______ the first clock with a face and an hour hand was made.
You didn’t let me drive. If we _______ in turn, you _______ so tired.
It’s obvious that the Beijing Olympic Games _______ a great success.
The information on the Internet gets around much more rapidly than ______ in the newspaper.