Chia từ

1. Listen to those people ! What language they ( speak) ………………….?
2. It's an awful film. It is the worst film that I ever ( see)………………..
3. Khanh usually  (play)………..football with his friends after school but yesterday he  ( not play)………as he was tired.
4. If we (not economise) ……………….on electricity, there will be power cuts.