21.They seem _____________________ what they are doing. A. know B. to know C. knew D. knowing 22.What’s _______ at the City Theater tonight? A. with B. on C. for D. from 23.It’s a _______________ to meet your grandparents. A. pleasant B. please C. pleased D. pleasure 24.My father prefers reading to ___________________TV . A.watching B. watch C. watched D. watches 25.You can see a lot of famous paintings at this ___________________. A. exhibition B. demonstration C. invention D. service 26.The water wasn’t ___________________ to boil the eggs. A. enough hot B. hot enough C. enough hot to D. enough hot for 27.Can you tell me when A. Bell ____________ the telephone? A. invented B. is inventing C. did invent D. invents 28.Susie made this doll’s dress __________________. A. with herself B. by herself C. on herself D. at herself 29./ his /successfully / Bell / to the public / demonstrated/ invention/ . / A. Bell demonstrated his invention to the public successful. B. Bell successfully demonstrated his invention to the public. C. Bell demonstrated successfully to the public his invention. D. Bell demonstrated to the public his invention successfully. 30.He came _______________ a device when he returned home from the hike. A. into B. up with C. out with D. over