The old man walked . . . . . . . . the road slowly. Which preposition is suitable to fill the blank?

I waited . . . . . . . . the bus stop for ten minutes.

I am envious . . . . . . . . them?

Nelson Mandela was born . . . . . . . . Mvezo in South Africa.

He is known . . . . . . . . me. Which preposition is suitable to fill the blank?

My grandmother died . . . . . . . . 7 pm . . . . . . . . 12<sup>th</sup> August 1989.

What is the cause . . . . . . . . the problem?

"When I grow . . . . . . . ., I'm going to travel all over the world," the little girl said.

Ravi reached Germany . . . . . . . . the 7<sup>th</sup> of January.