— Is that your best friend Simon?---No, it ______be him. He flew to Hong Kong yesterday.
You should eat lots of _______, because it’s good for your health.
I saw them _____ basketball at this time yesterday.
John _____ go there with us tonight, but he isn’t sure about it.
You must ______ your cigarette when you are at the gas station.
Her grandparents are still in good health ______ they are over eighty.