Jennifer and Susie (1) (write) were writing invitation cards.
Then Jack, Tom and Charlie (2) (come) came and
(3) (colour) coloured the invitation cards very nicely!
While Jane's mother (4) (make) was making chocolate cakes at home,
five of Jane's classmates (5) (cut) were cutting sandwiches.
Neil and Nelly (6) (draw) were drawing some pictures while Betsy
and some other girls (7) (decorate) were decorating the classroom.
Emily's and Kim's mothers (8) (prepare) were preparing fruit
salads when Betsy's mother (9) (come) came to help them.
When the children and their mothers (10) (finish up) finished up all the preparations, Kim's and Tom's fathers
(11) (arrive) arrived. They (12) (bring) brought a lot of chocolate bars for the whole group.
Ответ: See above
Ты молодец! У тебя всё получится!