The only way is up (Optimise B1+)

When we arrived at the airport, we ... picked up by some friends.

• have been

• were

Scientists have announced that liquid water ... discovered on the planet Kepler 186f.

• was

• has been

More and more children ... taught their school subjects through internet classes.

• are being

• been

4 The holiday was a disaster but we ... given any money back by the tour operator

• wasn’t

• weren’t

Altitude sickness ... caused by going from low to high altitude (over 2,500 metres) too quickly.

• is

• is being

The Great Wall of China ____ more than 2,000 years ago. (build)

The new visitors’ centre ____ at the end of last year. (complete)

There’s a problem with the new mobile device. Twenty mobile phones ____ since yesterday. (return)

Tomorrow, before the start of the tour, you ____ to our tour guide. (introduce)

The discovery _____ by a group of children who were climbing the mountain. (make)