b. I enjoy surfing on the Net but I don’t have much time for it

c. I enjoy surfing in the net but I don’t have much time for it.

d. I enjoy surfing on Net but I don’t have much time for it.

42. prints / collection / have / colour / 19^th century / rare / my father.

a. my father has rare collection of 19^th century colour prints.

b. My father has rare collection in 19^th century colour prints.

d. My father has a rare collection in 19^th century colour prints.

43. her / scientist / eager / be / experiment / results / analyze.

a. The scientist was eager to analyze the results on her experiment.

b. Scientist was eager to analyze the results of her experiment.