If you have dimeulty_____________ your bills, tell your utility company as soon as possible.
A. pay
B. paid
C. to pay
D. paying
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After the bargaining process _______________, a final agreement was signed.(2018年12月第22题)
A. is completed
B. had been completed
C. has completed
D. had completed
If people don't like________________ by titles, you can ask them how they prefer to be addressed.(2018年12月第30题)
A. are called
B. being called
C. be called
D. called
Generally speaking, you should arrive at the airport with plenty of time____________.(2018年6月第27题)
A. sparing
B. to spare
C. spare
D. spared
___________you want some samples of our new products, you might contact our sales manager.(2019年12月第23题)
A. If
B. While
C. Until
D. Although