The time for people to think more about showing thanks is (by the end of a year).
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It is now very common for people to use (posts) to thank the volunteers.
A. 对
B. 错
What may give the volunteers a sense of belonging is to hold (potlucks) in the office.
A. 对
B. 错
Sending out cards could let the colunteers know that people are (grateful) to them.
A. 对
B. 错
The volunteers working in the library seemed to (appreciate) the staff's silent way to (recognize) them.
A. 对
B. 错