B：Oh，Tom．You said a dinner，tonight？
A：Yes．
B：I can't tonight，mother has a cold，I must stay at home andlook after her．But I'd love to some other night．
A：Oh，what's a pity！You'd better set up an appointment to seea doctor as soon as possible．
B：Yes．Thank you．
A：I'll call you back later，Bye-bye．
B：Bye．
Dialogue C
(A：Operator B：Li Ming)
A：Hello．How can I help you？
B：Hello．Look，I think my phone is out of order．
A：What seems to be the problem？
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