You mustn’t ________ the key words while copying the composition.[ ]

Mr Johnson, what are teachers supposed to do for the students?—As teachers, we feel ________ our duty to teach our children to be good wherever we are.[ ]

Thereare many supermarkets in this town, but we think this is _______ of all.

e finally figured out the puzzle!—Yeah, in a complex way, _____．

It _____ last week that the haze(雾霾)in Beijing caused many problems.