After the argument Colin ran away and______since.

A new iPad in the market costs about ______ of a second-hand one.

下列各句中，没有语病的一项是（ ）

have a talk with you at about 5this afternoon, MrSmith— All right, I ______ to my office from aconference thenIwill be waiting for you there

Kidsshould be encouraged to get involved in activities ___ they meet other kids