Choose the best option to complete the following sentences.
Question 1. While Tom …………… English to poor children in Phnom Penh last year, he ……………… a lot about Cambodian culture.
A. is teaching – knows
C. taught – was knowing
B. was teaching – knew
D. was teaching – was knowing
Question 2. My passion for volunteering to help children ………………… during my middle school years while I ……………. for the summer community service.
A. begin – work
C. began- was working
B. have begun – have worked
D. was beginning – was working
Question 3. Volunteers ……………… games and ………………. activities with disadvantaged children while they ……………. for the center.
A. played – had – worked
C. were having – having – were working
B. have played – playing – are working
D. played – had- were working
C. were having – having – were workinB. have played – playing – are workingD. played – had- were working