English teachers are supposed ______their students a test in class, even after class, ______better teaching results.

__after drinking even a small amount of beer is also regarded as violating the traffic regulations.

Every device ______in the plane must be designed and made with great care so as to make sure that nothing goes wrong in operation. 

There is nothing interesting　　 at present.

One-room schoolhouses can still be found in _____ areas where there are no other schools for many miles.