Excuse me. Is this the right way to the Summer Palace?— Sorry, I am not sure. But it ______ be. [ ]

Please pick up the ____. Don’t keep it onthe floor.

While there are some differences in the educational systems in many countries in the world，education is ________.[ ]

The two brothers look so much alike that it is difficult to ______.

Have you ever comehere before?-No, it is the first time that I_ to this city. [ ]