1.2 They are trying to design generations that will produce high-pressure steam as___as possible.

1.18 However, radio is already rapidly becoming（ ）to thousands of people in these areas.

1.17 He often talks as if he（ ）（be）my father.

1.16 When he was questioned about the missing ring,he firmly（ ）that he had ever seen it.

1.15 Color-blind people often find it difficult to（ ）between blue and green.

1.14 I always（ ）what I have said.

1.13 She could hardly（ ）laughing. x

1.12 Opportunities are always available（ ）one uses his mind.

1.11 （ ）can theory be separated from practice.

1.10 I expect her to（ ）her obligation.

1.9 All his evenings were（ ）with study.