He likes to ____(participation) in all kinds of activities on campus.

Which of the following are deductive arguments？ A: All dogs are mammals. All mammals have kidneys. Therefore all dogs have kidneys. B: Since all squares are rectangles, and all rectangles have four sides, all squares have four sides. C: All science teachers are smart, since all my physics teachers, chemistry teachers and biology teachers are smart. D: The sun is a star; the sun has planets; therefore some stars have planets.

All the teachers and students are ____to attend it on time.

All the people at the conference are. A: mathematic teachers B: mathematics teacher C: mathematics teachers D: mathematic’s teachers

The undesirable qualities of teachers are all the following EXCEPT______.