Put the verbs in parentheses into a correct tense.Use Past Simple or Past Perfect only: I...

Question

Put the verbs in parentheses into a correct tense.Use Past Simple or Past Perfect only:
I (wait) until everybody (leave)
The teacher (be) very angry when he (see) what the boys (do).
I (not be) there five minutes when all the lights (go) out.
When I (show) him what I (write),he (say) it (be) very good.
By the time we (get) there, most of the guests (arrive).
He (thank) me for what I (do) and (say I (be) a great help to him.
As soon as I (do) it, I (realize) that I (make) a mistake.
He (not tell) anybody what he (do).
I`m sorry. I (think) I (tell) you.
The students (be) in the classroom more than ten minutes when the teacher finally (arrive).
Although he (study) English before he (go) to England, he never (hear) the language spoken so quickly.
At first he (not understand) anything, but when he (be) there about six nonths, he (be) able to carry on conversation.

Answer 1

I had waited until everybody leaved.
The teacher was very angry when he saw what the boys had done.
I had been there five minutes when all the lights went out.
When I showed him what I had wrote,he sayed it was very good.
By the time we got there, most of the guests had arrived.
He thanked me for what I had done and say I was a great help to him.
As soon as I did it, I realized that I had made a mistake.
He didn't tell anybody what he had done.
I`m sorry. I thought I had told you.
The students had been in the classroom more than ten minutes when the teacher finally arrived
Although he had studied English before he went to England, he never had heard the language spoken so quickly.
At first he didn't understand anything, but when he had been there about six months, he was able to carry on conversation.