21 .The roads are crowded __________ walking to work is even quicker than driving.
A. so that B. in order to C. so as to D. so as that
22. Not until I began to work ________ how much time I had wasted.
A. didn’t realize B. did I realize C. I didn’t realize D. I realized
23. The girl’s face looked pale, so our classroom teacher requested that she ________to hospital immediately.
A. send B. should send C. sending D. be sent
