Use past simple, past perfect or past perfect continuonus.
1) ) tired because ) at his report all day long.
2) first ) breakfast, and then she ) her bag.
3) ) the question for an hour, they ) to a mutual decision.
4) they ) their homework for more than an hour and a half when their )
5) the student ) tha room as soon as he(finish) speaking.
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ответ: 1) was

2) worked*

3) had

4) packed

5) discussed

6) came

7) have done

8) arrived

9) has left

10) finished

Объяснение:

1) Paul was tired because he been working at his report all day long.

Paul was tired - Past Simple

he been working - Past Perfect Continuous

2) First she had breakfast, and then she packed her bag.

she had breakfast - Past Simple

she packed - Past Simple

3) After they had discussed the question for an hour, they came to a mutual decision.

they had discussed - Past Perfect (в данном случае действие "had discussed" в Past Perfect стало причиной того, что произошло другое действие "came" в Past Simple, то есть подчеркивается больше результат действия "had discussed" нежели затраченное время "for an hour")

they came - Past Simple

4) They had been doing their homework for more than an hour and a half when their parents arrived .

They had been doing - Past Perfect Continuous

their parents arrived  - Past Simple

5) The student left the room as soon as he had finished speaking.

The student left the room - Past Simple

he had finished - Past Perfect