As he isn’t here, I ________ that he must have missed the train.
A. sure
B. suppose
C. certain
D. doubt
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They are making telephone ________ about a new product.
A. inquiries
B. requests
C. requirements
D. researches
My car ________ from his in colour.
A. likes
B. matches
C. equals
D. differs
Jane received an/a ________ but she didn’t accept it.
A. host
B. stranger
C. guest
D. invitation
More and more students want to become ________ singers.
A. working
B. professional
C. efficient
D. career