May I ____________ Li Ming to our house, Dad?[ ]
A. inviting
B. to invite
C. invite
答案:C
已知等边圆柱(轴截面为正方形)的侧面积与一个球的表面积相等,则这个圆柱与球的体积之比为[ ]
A.1:1
B.3:4
C.4:3
D.3:2
用所给单词的正确形式填空。
1. Last football match was very ______ (excite).
2. ______ (stay) up late is bad for your health.
3. Why don't you ______ (give) up smoking?
4. My parents didn't feel ______ (good) last Sunday.
5. ______ (not walk) on the lawn. We must protect (保护) our environment.