--Would you like to play chess with me?---Sorry, I have to finish my homework
She stepped into the bedroom quietly_______ she might wake up her roommates.
Many people have been ill from a strange disease these days,________ we’ve never heard of before.
—He_______ to the meeting. Have you informed him of it? —Sorry. I________to.
It is not enough only________ the rules of grammar if you want to learn English well.
He________ the person referred to be put in prison.