19. She __________ blood twenty times so far.
A. donates B. has donated C. is donating D. to donate
20. Volunteers can do general ______ such as clean-up projects or home repair.
A. things B. labor C. jobs D. activities
21. We came to the remote village and ______meals for homeless children.
A. cook B. offered C. do D. made
22He __________ lectures to foreign tourists about traditional food and games recently.
A. gives
B. gave
C. have given
D. has given
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III. Match a question in column A with its answer in column B.
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