Scientists often that farmers use natural ways to grow fruits．（suggestion）
Our manager greeted the guest with a smile at the entrance．（polite）
For your ，smoking is not allowed during the whole flight．（safe）
Failure isn't always bad．It can teach you lessons．（use）
In the school hallways，the students are supposed to speak and act quietly （quiet）．
The seat is hard and （comfortable） to sit on，so I have a sore back．
The math problem isn't difficult，and I can work it out （easy）．
Which is more （value） to you， health or wealth？
Liu Mei's parents are both excellent （teach）in our city．
He is too weak． It's （possible） for him to move the heavy box．
He is too weak． It's （possible） for him to move the heavy box．
With the （develop）of science and technology，life is becoming much easier．
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