____ English for more than six years, he can speak and work very well with that businessman from England. [ ]

Have you found your lost mobile phone — No, I haven’t found , but I bought this morning.

He finds it hard to keep _____ with thechange of society if he stops learning．

The Olympic Games _____ in London in 2012. Ihear it _____ in different countries every four years.

________ in the traffic jam,they had to wait for two hours[ ]