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The factory ____________ far less electricity since it switched to more efficient machines.　

A. had used

B. used

C. has used

D. uses

His academic results have improved ______ .

A. after he had taken this course

B. before he took this course

C. when he was taking this course

D. since he took this course

Choose the best way to correct the sentence: After learning to sit and roll over, Walter entered his puppy in a local dog show.
A. After Walter learned to sit and roll over, the puppy entered him in a local dog show.
B. After Walter’s puppy learned to sit and roll over, Walter entered him in a local dog show.
C. It’s already correct.

This is the first letter he _____ since he went abroad in February

A. should write

B. wrote

C. was written

D. has written

E. might write