If you don’t know how to read new words, ____ them____ in a dictionary.

It’s not always necessary to look up the words ________ the dictionary while reading.Sometimes we need to guess.

You can’t put it here. You must ______the right place.

    A. look at          B. look for           C. look down   D. look up

People along the river didn’t allow them to ______ a factory so as not to pollute the water.

A. set up ??????????? B. give up??????????? C. take up?????????????? D. look up