I left out a sentence. Can you help me better express the following instruction?

1) Complete the following sentences with the past simple, past perfect, and past continuous.

1) My friend..... (be) upset because someone.....(steal) ........

... with simple past, past perfect, and/or past continuous tense.

Or do you want students to write each sentence three times, once with each of those tenses?

To better express the instruction, you can use the following wording:

1) Fill in the blanks with the appropriate form of the past simple, past perfect, or past continuous verb tense in the given sentences.

1) My friend ______ (be) upset because someone ______ (steal) ________.