[ Idioms ]
That book will come ___ very useful.
a. up
b. in
c. down

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Grammar and Vocabulary › ViewWe watched a video showing the various stages in the production… glass.
A. in
B. at
C. on
D. of
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Engineers________ for work on the new space program.
A. necessary
B. are needed
C. hopefully
D. next month
Grammar › ViewYou can now communicate ………….…… your friends online using your mobile phone.
A. of
B. in
C. for
D. with
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Which word best describes someone who enjoys being alone and being quiet?
A. outgoing
B. energetic
C. reserved
D. empowering