The number of newly-added jobs increased rapidly in underdeveloped west China, while that of central China remained _______ in the first six months.
It’s the gases ___ natural gas and the burning of coal give off ____ add to the overheating of the earth.
The teacher doesn’t believe his reason for being absent from class ___ he was ill, ____mad him sad.
—— Bob has gone to California. —— Oh, can you tell me when he _____?
It’s easy to learn a country’s culture if one is ____ with its language and customs.
In it were photos of all the actors of our show, _____ signed by each performer.