Chinese is becoming more and more popular. It ________ in many schools in foreign countries.
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A
teaches
B
is teaching
C
is taught
D
has taught
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I saw him in the library yesterday.  He ________ a book at that moment.
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A
reads
B
is reading
C
was reading
D
will read
He __________ when I go to see him.
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A
will always work
B
has always worked
C
is always working
D
works always
My mother was cooking while I_________ the radio.
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A
listened to
B
have listened to
C
was listening to
D
am listening to