It was in 1969 ________ two Americans went to the moon by spaceship.
They ______ the train until it disappeared in the distance.
—I’ve got a headache again! —Sorry to hear that. Walk to work every day and you’ll soon back in ______.
The patient's son asked the doctor the question________his father could survive the big operation.
I called the airline to________my flight reservation a week before I left for Toronto.
__________ has been announced, we shall have our final exam next month.