The earth could be younger and took more than three times longer to form than _______ thought, according to a new study.

 After two years’ study, he now has a __________ better command of English.

There is no ______ swimming-pool in this school and the students often go to swim ______. 

They have held three meetings this week _________.

.Computers and mobile phones, playgh they are indeed making our life________and more________have reduced the need for face-to-face cotyr unication.