Someone called me up in the middle of the night, but he hung up ______ I could answer the phone.

Uncle Wang didn’t stop to have lunch __he finished mending the TV set. 

—　　　do you have an Art Festival in your school? —Once a year.

—We can’t climb the mountains            the bad weather.—What a pity !

Tom is only four years old, __________ he can draw beautiful pictures.