A reward of $1,000 will be given to can provide any clues to the case which has been investigated by the police for nearly half a year.
28. Not until the train pulled into the next station ______________ her suitcase gone.
27. Since 1994, the glacier in Antarctica has lowered by as much as 90cm, ______________sea level to rise.
26.—Flight MU257 _______________ . I must be off now. —Have a nice trip.
25. When _______________ comes to saving energy, big changes start with small steps, like turning off the lights.
24. Of the two cameras, I would prefer _______________ one, which is very easy for me to carry.