Relative Clauses

This tastes awful! I don't know ..... I ordered it!

It was raining by the time ..... we got there.

Is this the place ........ we're supposed to meet them?

She works in a building ............ used to be a hospital.

Is that the reason ............ she never answers your e-mails?

Agatha Christie is the writer ............. invented Miss Marpel.

1969 was the year ............... human beings first landed on the moon.

What a terrible thing to say! I don't know ............ she is always so rude to me.

I could never live in a house ............. doesn't have a nice garden.

Do you remember the day .................. we met?

There were a couple of questions ................ were difficult for me to answer.

I'm afraid it's by an author .................. name I can't remember.