Speak to him slowly _____ he may understandyou better.

It’snearly 5 years since I worked in the company I _______ in a school

Man’s understanding of nature is developing ________. It never stays at the same level.

If I______ you, I_______ go thereat once.

The two organizations will arrange a one－year seminar and________ it with a report on their in－depth studies and research findings.