I think that's unlikely to happen, but if that_______, both America's and China's interest would be severely damaged.

 It was ordered that all the soldiers ____ to the front．

It’s required that mineral resources_______ hand in hand with the local environment protection.

一What does the sign over there read?一“No person ______ smoke or carry a lighted cigarette, cigar or pipe in this area.”

-- It’s many years since I saw you last； I _____ you at all.--- I wouldn’t have, either, if someone ______ you by the name.