The young man _______his ordinary income by writing some essays.

As President of the Clifton Business Club, I would like to invite you to speak at our annual dinner on 5 July. The dinner which starts at 7. 30 p.m. will be held at the Mayflower Restaurant, Clifton.
I hope that you are able to accept the invitation and would be grateful if you could give me the subject of your talk, so that I can include it on the invitations to our members.
I look forward to receiving your reply as soon as possible.
？Write a letter to Mr Biggs:
？accepting the invitation
？telling him the subject of your talk
？asking how long the talk should be
？enquiring whether accommodation will be arranged for you.
？Write 60-80 words
？Do not include any postal addresses.

A、钢木屋架中的钢结构部分另列项目计算
B、檩条的托木和垫木不计算
C、屋架中的托木和夹板工程量不计算
D、屋架中螺栓另列项目计算