Grammar: Unit 3: Far from home

We .......... through Wadi Rum when the sandstorm started.

While Rami .......... his bag, the taxi arrived.

The plane .......... off when the pilot saw the problem.

I .......... my phone when I was running to catch the bus.

What .......... at 8 o'clock last night?

It .......... and the wind was blowing hard when we left the hotel.

Mansaf is a dish .......... is made with lamb and jameed.

Petra is the city .......... the Nabataeans built.

Aqaba is the town .......... we stayed last summer.

The man .......... showed us the way was very kind.

That's the girl .......... brother is a famous footballer.

The Arabian oryx is an animal .......... lives in the desert.

In which sentence can we leave out the relative pronoun?

In which sentence can we NOT leave out the relative pronoun?