21. It is said that the company in ______ charge of him is in_____ debt now.
A. the; the B. /; / C. /; the D. the; /
22. As is known, mobile phones make it possible for people to ______ each other conveniently.
A. keep in touch with B. get in touch C. lose touch D. be concerned
23. If you are _______ about Australian cities, just read the book written by Dr. Johnson.
A. worried B. anxious C. upset D. curious
24. I should like to buy a house, modern, comfortable, and ______ , in a quiet place.
A. first of all B. after all C. in all D. above all