He will abide by his promise if he gives it.
Meanwhile, I always kept in touch with my former professor at college, by letter and telephone.
A．kept pace with
B．kept in contact with
C．had an idea of
D．exchanged letters with
Directions: In this section there are 10 sentences, each with one word or phrase underlined. Choose the one from the 4 choices marked A, B, C and D that best keeps the meaning of the sentence. Then mark the corresponding letter with a single bar across the square brackets on your machine-scoring ANSWER SHEET.
The peahen is a bit smaller than the peacock and does not have a long, colorful tail.
Woman: What do you think of Dr. White's chemistry class？Man: Now there's a teacher who knows her subject!Question: What does the man mean？
A．Dr. White teaches many different subjects.
B．He knows Dr. White very well.
C．Dr. White is very knowledgeable about chemistry.
D．He doesn't know what subject Dr. White teaches.