There are five chairs ___ ,but I am at a loss which to buy .
How can they learn anything _____ they spend all their spare time watching television?
We congratulated Jerry ____ the championship.
It took my father half an hour to finish ____ my bike.
Most students in my class are never _____ in the morning classes.
There are many advantages to live on the top of a high-rise, one of which is that you can get a good ______.