21. ______ Flying Luxury Hotel of Tomorrow is ______ huge 400-ton aircraft without wings.
A. /, a B. The, a C. The, the D. A, a
22. The Internet and the effect brought about did a lot of good to our daily life and work.
A. that B. what C. which D. it
23. ____ no cash for food, he broke into an old woman's house, hoping to steal some money.
A. Because B. As C. Since D. With
24. Not until the train pulled into the next station _______ her suitcase gone.
A. Mary had found B. had Mary found
C. did Mary find D. Mary found
