4. If there are questions, the students will
A) talk to the teacher through "intercoms".
B) Raise their hands and wait for the answer.
C) Discuss them with the rest of the class.
D) Solve the problems all by themselves.

5. Computer teaching will help the study in the following ways except that
A) teachers can give and collect homework using electronic mail system.
B) Examinations can be conducted on computers better than on paper.
C) Test scores can be obtained soon after the test is taken.
D) Certificates or diplomas are required if the students want to pass the tests.