—Everybody is going to climb the mountain.Can I go too,mom?—________ Wait till you are old enough,dear.
Tom was about to close the window ______ his attention was caught by a bird.
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.