1. Plastic bags are very hard to dissolve.___________, they will cause pollution. However                      So                                Although                      Therefore 2.  Tuan has been ___________ as the most effective activist in the town charity program. congratulated               celebrated                  nominated               distinguished 3. “Let me congratulate you on your nomination for an Oscar!”-  “______________________” That’s right.       Well done.       That’s a good idea       It’s nice of you to say so