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13. When I came home yesterday - PAST SIMPLE  
the children were running and singing merrily. - PAST CONTINUOUS
 "We are learning a new song!"  - PRESENT CONTINUOUS
they cried. - PAST SIMPLE
14. When the young man entered the room, she looked at him in surprise. - PAST SIMPLE
 "What do you want to tell me?"  - PRESENT SIMPLE
she said. - PAST SIMPLE
"Why have you come?" - PRESENT PERFECT
 15. It was raining hard  - PAST CONTINUOUS
when I left home yesterday, so I returned, put on my raincoat and started again. - PAST SIMPLE
Have a look!  That is the Golden Gate Brige on your left.-Oh,it is beautiful.- PRESENT SIMPLE
I've just taken a picture of it. 21. I have spained my ankle again.  - PRESENT PERFECT
22. A world-famous violonist is playing at tonight's concert. - PRESENT CONTINUOUS
 23. The children were playing with their train set the whole evening yesterday. - PAST CONTINUOUS 

Mechanics need the following skills:
 Customer Service Skills because Great mechanics are able to relate well to сustomers.
Communication skills because good mechanic has excellent communication skills and is able to translate complex technical jargon into plain language for the average customer.
Technical Aptitude because mechanics should be able to use a variety of technical tools to diagnose and solve a  problems. 
Leadership because mechanics interested in advancing in the profession have leadership skills and are able to take charge when situations warrant.
And some other skills.