On April 12, 1961,_____27—year—old Yuri Gagarin(尤里.加加林)became the first human to go into_____ space.
—Do you know the girl? —Yes, ______ name is Linda.
Helen is 15 years old, and Joan is 15, too. So Helen is ____ Joan.
—What ____ news! —Yes, all of the children were ____.
New York is one of ____ in the world.
Do you have difficulty ____ English?