My book is here. Where is _____? [ ]
A. your
B. your book
C. you book
答案：B
He _________his friend in the crowd at the first sight and called out his name.
A．spotted
B．watched
C．observed
D．glared
下列组合键不能切换应用程序窗口的是（）。
A.ALT+TAB
B.ALT+ESC
C.CTRL+ESC
D.CTRL+F6
