Mary wants to know ______.
Hurry up, Mike. You must get to the airport an hour before the plane _____.
-- ________ will you come back from the library, Linda? -- In an hour.
I _____ the newspaper while my mother _____ TV plays yesterday evening.
– Which dress do you prefer? -- The red one. It _______ more beautiful.
16-year-old students in England should understand fifteen _______ words.