He began to take political science only when he left school [ ]

don’t believe what he told us about meeting Yi Zhongtian. I think he was ______ the story.

We found _________ necessary _________ our pocketmoney to support Project Hope.

Your uncle will come to see you as soon as he here.

The colors on the national flags can be ______ differently in different culture, but they have one thing in common, that is, ______of the colours was carefully chosen.