⑴Is that bag heavy ?                           A、Certainly .

⑵What day is it today ?                      B、You're welcome .

⑶Is it empty ?                                     C、It's Thursday .

⑷Who's on duty today ?                    D、Yes , it's heavy .

⑸Can you carry this bag ?                  E、Li Lei is on duty today .

⑹Let's put the books on the desk .    F、Yes , it is .

⑺Thank you .                                      G、OK .

⑻Could you help me ?                       H、Yes , we are all here .

⑼Let me help you .                             I、No , thanks .

⑽Are we all here today ?                    J、No , I can't .