His eyes shone brightly when he finally received the magazine he ______.
A. had long been expected
B. had long expected
C. has long expected
D. was long expected
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28()
A. came into being
B. came into use
C. began using
D. started to publish
He'll be an astronaut by the time he ______ thirty.
A. is
B. had been
C. will he
D. is going to be
The native language is a person's()language.
A. first
B. only
C. one
D. foreign
Walt was () when be heard the strange sound.
A. reading
B. singing
C. drawing
D. playing