I shall never forget the days ________ I spent in Beijing University, ________ has a great effect on my life.
Not until the train pulled into the next station ____ her suitcase gone.
Since 1994, the glacier in Antarctica has lowered by as much as 90cm, ____sea level to rise.
—Flight MU257 ____ . I must be off now.—Have a nice trip.
When ____ comes to saving energy, big changes start with small steps, like turning off the lights.
Of the two cameras, I would prefer_____ one, which is very easy for me to carry.