._____from heart trouble for many years, his father has to take some medicine with him wherever he goes.
10. The World Wide Web is sometimes jokingly called the World Wide Wait because it ______ be very slow.
9. Many young people in the West are expected to leave ______ could be life's most important decision --- marriage --- almost entirely up to luck.
8. We missed our train, and ___ the next train was delayed, ____ we had to wait for two hours.
7. Not only ______ interested in football but ______ beginning to care about it.
6. Measures have been taken to prevent accidents, but much ______ for more improvement.