Many people enjoy spending their free time doing volunteer work
`->` Many people are interested in spending their free time doing volunteer work.
`=>` enjoy/ like = be interested in/ fond of/ keen on: thích cái gì đó.
10. Few people joined in the Games in 1976 took
`->` Few people took part in the Games in 1976.
`=>` take part in = join in: tham gia
"In 1976": năm quá khứ, "take" `->` "took"