Here are the completed sentences with the correct forms or tenses of the verbs in the brackets:

a. (51. write) **Having written** the letter, she put it in an envelope.

b. When Linda (52. come) **came** back from the beach, she (53. look) **looked** very red from the sun.

c. Yesterday I (54. walk) **was walking** along the street when I (55. realize) **realized** a man with a black beard, whom I (56. see) **had seen** three times already, (57. follow) **was following** me.

d. Hello, Mary. The party last night was great. You should (58. come) **have come**.

e. We fell over some pieces of wood (59. leave) **left** (60. lie) **lying** around.