6. ______ matters most in learning English is enough practice.
7。 --It's $500, but that is my last offer。
--OK, it is a ______.
8. The reason ______ I have to go is ______ my mother is ill in bed.
A. why; why
B. why; because
C。 why; that
D. that; because
9。 A good storyteller must be able to hold his listeners' curiosity ______ he reaches the end of the story。
10. ______ did we go swimming in the Changjiang River.