Use the new words to complete the sentences:

1) Students show their respect for the teacher by behaving themselves. 2) He always worked hard and was a brilliant student, and he graduated from university with excellent marks in all the subjects. 3) When did he enter college? 4) We never miss the opportunity to speak to them. They know so much. 5) Pushkin's contribution to the development of the Russian language is really great. 6) He has really improved his knowledge of mathematics. 7) You should improve your presentation.