用现在完成时完成下面句子.1.They ______(finish) their home work.
2.Mr and Mrs Li ________(not come) back yet.
3.John ______ (play)this computer game a few time.
4.We _____(not see)that film yet .
5.Mr Dong ________(repair) ovr ten bicydes since last Monday.
6.You ______(not visit)me for a long time.