—This physics problem is too difficult. Can you show me _____, Wang Li?—Sure.A. what to work it outB. what to work out itC. how to work it out
-- Has your friend completed his design?-- Not yet. He ________ on it last night.
A big smiling face on the paper________ me _______ a happy feeling.
Don’t eat the fish. It smells ________.
I asked two students the way to the post office, butof them knew.
At present lots of people would rather _______ in the country because there is ________ air pollution in the country.