Choose the underlined part A, B, C or D that needs correcting

Ai làm giúp mik đc ko ạ, mik sẽ tặng xu vs chấm điểm người đó luôn nha, thank kiu
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Exercise 11. Choose the underlined part A, B, C or D that needs correcting.
1. Having leisure activities are truly important to the elderly.
A. Having
B. are
C. to
2. Although she wanted to go to the museum, she decided staying at home.
A. Although
B. wanted to go
C. decided
3. Parents are concerned that their kids may be spending too many time on screens.
A. concerned
B. spending
4. Collecting coins is exciting, but it can also be relaxed.
A. Collecting
B. is
5. Cloud watching sound weird, but Hang adores it.
B. sound
C. too many
C. exciting
C. but
D. elderly
D. staying
D. on screens
D. relaxed
D. it
A. Cloud watching
6. For some young people, enjoyment involves sitting in front a computer playing games.
B. involves
A. For some
7. His parents are thinking of banning him on using the computer.
A. thinking
B. banning
C. in front
C. on
8. When you play games online, be carefully when making friends with strangers.
A. games
B. carefully
C. making
D. playing games
D. using
D. with