短语检测 two ________ of three每三个中有两个；三分之二one ________三分之一once ________ seven years每七年一次for ________待售or ________左右，大约be ready ________...乐意……；愿意……
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．
During the period of recent terrorist activities, people _____ not to touch an unattended bag．
粤公网安备 44130202000953号