Not a single word at the meeting yesterday.
—I really don’t know how to thank you enough. —.
On our way to school, suddenly it began to rain, and we hurried to take______under a big tree.
I can still remember that it is since the 1990’s, _____ we began to use cell phones,_______ the number of mobile users has greatly increased.
—I can never forget the day ___ we spent together in the summer camp. —Well, especially the day _______it suddenly began to rain in the middle of the night.
Every one of us must know this: _________ we live can we save the earth.