You look unhappy, what’s happening, my son? —I’m wondering how long it’ll be________ we come to China again.

We are going to Yunnan for vacation. We’re staying there _____ half a month.[ ]

It’s very cold _____ winter there. [ ]

Look! There so many people in the park. —Nobody likes to stay at home ______ Sunday morning.[ ]

Everyone ______him, because he is friendly.