I never doubt _____ this exhibition is worth ________.
—_____ will you play basketball with me? —In about 20 minutes after finishing my homework.
Daniel is good at computer. He taught _____ to make a home page.
I _____ walk to school. But this morning I took a bus because I got up late.
Mr. Chen is _____ generous man. He has donated a lot of money to people in need.
At the foot of the hill you could hear nothing but the ______ of the running water.