Healthy diet should ________ some nutrition (营养素), ________ sugar, protein and calcium.
Do ________ you think is right _________ difficulties you may have.
— I phoned you at about three this afternoon, but no one answered. — Oh, that was probably _______ I was doing exercise outdoors.
Everyone knows that ______ paper was invented by _______ Chinese.
__ it is to have a picnic in the hills on such a nice day!
I wish I____ my uncle yesterday.