He might have_____ his idea about the artat the exhibition much better if he had planned what he wanted to say

Do you know our town well?— No, this is the first time I _______ here

I wonder whom you are waiting for.—The policeman _______ the trafficaccident.

He ______ English for six years by the timehe takes his examination.

一Are you going to Guilin by plane 一It’s fast but expensive, so I’m not sure．I ________ take a train．