青少年时期积极参加社会实践活动,可以( )①学到课堂上学不到的东西 ②可以把课堂中的理论知识的学习同社会实践联系起来,加深对课堂学习的理解③可以培养和锻炼我们的实践能力 ④可以加深我们对社会的了解,培养我们对社会的责任感
----Pardon? I didn’t hear you just now. ---- I asked_______________________.
The stones are so heavy. How _____ they _____ to the top of the building without modern machines?
No free plastic bag in the supermarket helps to _____ white pollution.
–Would you like to food and clothes to the old at a home for the elderly with me? –Of course I would. It’s very meaningful.
We _____ walk in the park after supper, talking about all _____ we were interested in.