I wrote to my parents once a week,____ I was too busy with my teaching work

ience of computer, _______rapid progress hasbeen made in recent years, is the most important of all science.

Great inventors don’t ________ graduate from famousuniversities. Some didn’t even go to university.

an beings experience a great liberalization andopen-mindedness, which is ______ in our daily attitude to the disabled, olds,females, especially homosexual populations

Do you have anything to say for yourselves?—Yes, there is one point ________ we must insist on.