Sequence of Tenses

I knew that Mercury (be) the closest planet to the sun, but I didn't feel like answering the question.

We didn't know the score, but we were sure their team (lose) the game.

The children were afraid of making any noise - Mom (sleep).

We were told that Alex (go) to enter that college.

My parents decided that we (celebrate) my birthday on Sunday.

Helen hasn't been informed that the lecture (not/take place) on Wednesday.

Diana hoped that her boyfriend (help) her with her car.

Yesterday Nina heard that her aunt (be ill) for five days.

She gave all her money to me because she (trust) me.

The police found out that William Smith (live) in London's suburbs at that time.

The student wasn't able to do the translation because he (not/know) some special terms.

They informed us that they (send) the books by parcel post.