Please remain _________ until the plane hascome to a complete stop.

Look! Can you see a boy ______ a kite over there—Yes, let’s go and see.

________my dear teacher couldn’t understand was ________ fewer and fewer middle school students showed interest in her lessons.

Leaves are found on all kinds of trees, but they differ greatly _____ size and shape[ ]

If our governmentattentionto controlling food safety now, our health ________ in danger.