计算电气照明图中导线根数的计算方法，希望能详细点

Here you are~~~~
Key to Pre-unit Test 2 Key structures
Aa1.I enjoyed the film yesterday.2.My brother went to market.
3.The children asked questions continuously in class this morning.
4.We stay at home on Sundays.
5.I borrowed a book from the library this morning.
b.1.She rarely amswers my letters.
2.The shops always close on Saturday afternoons.
3.We never work after six o'clock.
4.We sometimes spend our holidays abroad.
5.Do you ever buy CDs?
Ba are playing...play...is kicking...is running
b died...left...spent...bought...went...stayed...listened...lent...kept...lost
c I have just received...He has been there...he has already visited...He has just bought...and has gone d 1.What did you buy yesterday?2.Up till now,he has never lent me anything.
3.Have you burnt those old papers yet?4.He fought in Flanders in the First World War.
5.We have just won the match.
e 1.was leaving...arrived 2.was working...was sitting 3.was walking...met 4.was reading...heard
5.dropoped
f I shall go to the theatre...Reg and I will see the first performance...the producer will give a short speech.He will speak to ...The play will be very successful and I think a great many people will enjoy it very much.
g 1.shall be ironing 2.will be arriving 3.We'll be seeing 4.shall be watching 5.will be correcting
h 1.After she had written the letters,she went to the post office.
2.After he had had dinner,he went to the cinema.
3.When I had fastened my seat belt,the plane took off.
4.We did not disturb him until he had finished work.
5.As soon as he had left the room,I turned on the radio.
i was built...had become...died...was built...were called...was begun...was complete...cost...has been visited
j 1.told...would come 2.said...cut 3.told...had never played 4.did he say...had done
5.did he tell...bought
k 1.rains 2.will never pass 3.is 4.will get 5.enjoys
l Fishing...catching...catching...having spent...fishing...fishing...sitting...doing
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