David has made great progress. —-__________, and _________.

It’s a long time ago ______ I saw you last time.

talked with my grandma on the phone,she sounded weak, but by the time we ____ up, he voice had been full of life．

Occasions are rare _____ I can spend a day withmy daughter —- You should spare some time to accompany her

With the Internet widely used, a(an)___change has taken place in the way people communicate with one another.