—Kathy and her sister are so alike.—I can’t tell one from ____.
.I wonder how he could __________ not handing in his maths exercises yesterday, for his maths teacher is always strict with his students.
.She was educated at Beijing University, __________ she went on to have her advanced study abroad.
.--- Can you read the sign , sir ? No smoking is allowed in the lift ! --- __________.
.Tom is reading a book __________ his brother is watching TV.
.My uncle __________ until he was forty-five.