A large amount of solar energy ________ electrical energy since amounts of advance equipment ________ introduced.

50Is there a gas station around _____ I can get some petrol?

The mayor has _______ to pick you up at the airport.

elen saw his tutor nod ________ toher, she calmed down and went on with her performance

This is the best hour I can _________ I_________ inthe past twelve years.