91______ finding solutions, it is unthinkable to solve all the problems the same way throughout the country

How long do you think the computer company brings out a new product?

_____ it is raining, _____ he is still working outside.

The boy, with his classmates, often ______ to the library on weekends.

Do you like this MP5 player, Tom—Yes. It can play beautiful music, __________it is very expensive.