I think students should have mobile phones to call their parents.—___________. They often use them to play games, instead.

When a new disease breaks out, experts must ________ what to do in the fastest way.[ ]

________ , we had to go home.

is surprising to us is that Tom, for ______English was once boring, can speak English fluently as though he were a nativespeaker

Please remember to _____ a stamp _____ your envelopebefore you post it to your friend