The children ______ a P.E. class on the playground when it began to rain suddenly.

They build a bridge of friendship ______ the mainland and Taiwan Island. [ ]

Look at the skirt. I bought it for my daughter ______ Children’s Day. [ ]

Li Ming is in poor health. He should pay more attention _________ exercise.

What happened _________ you? You look _________. -Some people cut the queue.[ ]