-I saw Mark on the playground just now.–No, it _______ be him. He is ill in bed at home.
Rather than ________ on a crowded bus, he always prefers________ a bicycle.
—Sorry, I’m late. Has the meeting begun?—It doesn’t matter. The meeting _______ for several minutes.
He didn’t listen to the teacher carefully._______ , he couldn’t answer the questions.
He is such a busy man that it’s hard for him to________ enough time to meet us at the airport.
Tom’s decided to devote all he could ________ his English before going abroad.