At times the balance in nature is ______ , resulting in a number of possibly unforeseen effects.
________ other children, the father thinks, Jack is ______ son.
第二部分:英语知识运用(共两节,满分45分) 第一节:语法和词汇知识(共15小题;每小题1分,满分15分) 从A.B.C.D四个选项中,选出可以填入空白处的最佳选项。 It never ___ to me that he had failed in the exam. A.occurred B.happened C.appeared D.sounded
Where she will go and when she will leave _____ what I want to know.
I find _____ difficult for us to master English if we don’t work hard.
The father as well as his three children ______ skating on frozen river every Sunday afternoon in winter.