Simple Past versus Past Continuous: um reforço!

Complete as frases com os verbos no Simple Past (ex. ate, swam, played, watched) ou no Past Continuous (ex. was eating, were playing):

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	(talk, type) While Peter 1 on the phone, Mary 2 a letter.
	(have, ring) We 3 dinner when the phone 4 .
	(do, go) The students 5 the test when the fire alarm 6 off.
	(finish, go) As soon as Mark 7 his breakfast, he 8 out to play.
	(wear, see) She 9 a red dress when I last 10 her.
	(play, cook) While the children 11 , their mother 12 .
	(phone, hear) She 13 her mother as soon as she 14 the news.
	(leave, start) As soon as he 15 the house, it 16 to rain.
	(fall, walk) The old woman 17 while she 18 .
	(take, be) I 19 a lot of photographs when I 20 in Scotland.