Put the correct forms of the verb “to be” : was or were.(Поставьте правильные формы глагола "быть": был или были.)
1) I (to be) reading a book when she came in.
2) They (to be) having tea when the telephone rang.
3) When the teacher came in, the student (to be) writing an essay.
4) We (to be) sitting in a cafe when they saw us.
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