You would use a semicolon (;) when you could stop a sentence but choose to continue it further.
The answer is d unless you messed up typing
Answer:
1. a) Tom goes to school every day
2. b) Mom finished her report yesterday
3. b) Nick washes his car every Saturday
4. b) They left berlin two years ago
5. d) I have already done my exercise.
6. c) Pam is drawing a nice dog at the moment
7. b) Ben won the competition today.
8. c) Liz is cooking dinner in the kitchen now.
9. b) We bought a new car recently
10. a)
11. c)
12. b)
13. a)
14. d)
15. d)
16. c)
17. a)
18. b)
19. d)
20. b)
21. a)
23. c)
24. c)
25. d)
26. b)
27. c)
