Some of this heat near the earth’s surface _________ make electricity.
It is in the hotel _____ he stayed last night ______ he lot his mobile phone.
Lydia doesn’t feel like ________ abroad. Her parents are old.
The book about environment ______ the importance of protecting the earth.
It was ______ back home after the experiment.
________ with the size of the whole earth, the biggest ocean does not seem big at all.