After Chang’e-3 landed on the moon on Dec 14, China became the third country _________ this after the US and the former Soviet Union.
I didn’t mean to break your vase—it was just ______.
He was breathing ______ after the relay race.
People are concerned about the quality of the air they ______.
She walked home by herself, ______ she knew that it was dangerous.
—Let's go Dutch for this supper, OK? —No,________this time, as a reward for all your help.