单项选择题
Numerous studies have shown that （） the teacher’s expectation， the greater the achievement of the student.
A.the higher B.the highest C.as high D.the high
单项选择题 Mychildrenarelookingforwardto（）atriptoBeijingnextmonth.
单项选择题 Doyouhaveanyideawhyhe（）？
单项选择题 JustasIwasleavingthehouse，itoccurred（）methatIhadforgottenmykeys.
