巩固练习
单项选择(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。
1．We have learned 3，000 words ________．
A．during past decade B．in the past decade
C．a decade ago D．after a decade
2．Our monitor made it _______ to read English every morning．
A．a habit B．habit C．rule D．a duty
3．Two years ago，I _______ a high school．
A．graduate for B．graduated from C．left from D．left for
4．_______ the good weather，we call climb the mountain easily．
A．Because B．As C．Thanks to D．Because for
5．The bedroom is twice _______ the kitchen．
A．as bigger as B．bigger than
C．big than D．bigger to
