John found it a challenge to meet the needs of the boss. __________, he had no way to satisfy him.
He must have finished the work yesterday, ____ he ?
Is there a shop aroun ____ we can buy some toilet articles?
He must have lived here for 10 years, ____ he?
___ smoking here will be fined.
"Where is it?" "Where is ____? I don't know what do you mean?"