难度：★ 考点：非谓语动词的用法
1. Welcome to our school, ladies and gentlemen. ______, I'd like to introduce myself.
A. To be honest B. To my surprise C. To start with D. To tell you the truth
2. ________ English well, one must have a lot of practice.
A. Speaks B. To speak C. Spoken D. Speak
3. -I'm leaving now.
-______you turn off the lights and the computer.
A. To make sure B. Make sure C. Made sure D. Making sure
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