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1. He failed the exam because he was too lazy.
Because of his . 

2. She′s our good friend.
She is . 

3. We′re going to read a story written by Mark Twain.
We′re going . 

4. Minh doesn′t like play football. He likes watching football on TV.
Minh would . 

5. Do not enter the house.
You must not .