__________ the convenience of digital payment, many senior citizens started to use smart phones.
A. To enjoy
B. Enjoying
C. To have enjoyed
D. Enjoy
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A few months after he had arrived in China, Mr. Smith ___________ in love with the people and culture there.
A. would fall
B. had fallen
C. has fallen
D. fell
China's image is improving steadily, with more countries__________ its role in international affairs.
A. recognizing
B. being recognized
C. to be recognized
D. recognized
What a pity! You missed the sightseeing, or we _________a good time together.
A. had
B. will have
C. would have had
D. had had
The doctor shares his phone number with the patients __________ they need medical assistance.
A. if only
B. as if
C. even though
D. in case