31. -- If you don’t bring a birthday present to Lucy, you may .-- Thank you for reminding me. Surely I’ll buy her one this evening.
John, you must get your room ________ after breakfast.
He reached the station _____ only _____ that the train had just left.
——We can never forget the days _______ the two astronauts in spaceship worked together and the days ________ we spent together.
The housewe used to livehas been rebuilt.
In an experiment, pet owners are being encouraged to take their pets to work, a move _______ can be good for both the people and the pets.