難度：★   考點：非謂語動詞的用法

　　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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