Mr.Morse，who graduated from a famous medical university，spent years ______ his skills as a doctor.
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A
adapting
B
acquiring
C
occupying
D
concentrating
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We are not ready to go into production yet. The new machine isn’t fully _____.
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A
worked out
B
turned out
C
left out
D
tested out
Mary is very clever and worth teaching , but her brother is not .Look ,he is now asleep in class .
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A
very ; very
B
much; very
C
well; very
D
well；fast
Before long he ______develop the shortcoming of being shallow and having prejudice, even against his old companions.
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A
forms
B
increases
C
develops
D
changes
—What is the boy doing?—It's not necessary for you to be ________ about others' business.
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A
connected
B
combined
C
contributed
D
concerned