(a) She knocked on the door of the manager's office before entering . (b) The bus was crowded (with many people) . -- No need to say "with many people"; that's what "crowded" means.
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(g) They are skipping rope in the park.
Vincent Teo(a) is OK.
(a) He is decorating the ballroom for the ceremony.
(b) My hobby is skipping rope.
(c) I like to skip rope with my friend.