---Do you want another drink?---_________.
On Sundays there were a lot of children playing in the park, and _______ parents were seated together joking.
American people are wondering whether the newly-elected president and his administration will keep the nation safe and defend it _______ any terrorist attack in the future.
I’ll go to America to strengthen my English_______ it isn’t too expensive.
This January will be very precious for us by which time we______ reviewing Senior Book I.
—What does Roger Brown do for a living?—He is one of the most successful________ in the city.