China’s _______ in 5G technology is expected to exceed one trillion yuan by 2025.
A. purchase
B. production
C. investment
D. expenditure
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Online ______ is growing fast as physical stores close down.
A. retail
B. retailer
C. retailing
D. retailers
________ of the new machine will start next month.
A. Product
B. Produce
C. Producing
D. Production
The worker oils the machine to operate it more ______.
A. efficient
B. efficiently
C. effective
D. effectively
He failed completely in the ______ of his duty.
A. performance
B. perform
C. performancy
D. performances
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