This question is ______ easy, all the students can answer the question

Soon there is enough force to lift the plane ___ the ground

You must pay attention to your handwriting __________ everyone can understand what you have written.

Smart phones are more and more popular now.—So they are. But they still ______ too much.

However weak we are, we can still do something againstthe powerful nature as long as we are ______ prepared.