题目内容

When you are talking with your customers, you must avoid _____ with them.

A. to argue
B. arguing

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In the next 10 years, healthcare career will be ______ than before.

A. more promising
B. promising

To get started with our business development, I suggested ______ some market research first.

A. to do
B. doing

According to the airline, each traveler _______one checked bag and one carry-on bag.

A. is allowed
B. allowed

A return ticket is often _______than a one-way ticket.

A. economicaler
B. more economical

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