I know you didn't go to school today．You a________ stayed in an Internet bar the whole day．

Hearing the familiar voice on the phone, I immediately r________ that it's John．

Some people like to travel around the world rather than s________ down when they are young．

Although school doesn't allow smoking, some students i________ it．

________　________, you should make a plan for your study．

It is impolite to ________　________　________ others．

Tim spent a whole morning to ________　________ my books．

I ________　________ being a great scientist when I was a child．

Once you make up your mind, you should ________　________ it．

Tracy met an old friend in the street ________　________．