The Holland Tunnel

This task is about adding words to a text so that it makes sense.
 
illustration: holland tunnel
 
The following piece of writing has some spaces where words are missing.
 
First, read the whole piece of writing through to get an idea of what it is about. Then fill each space with ONE word so that the whole piece of writing makes sense. You are able to change answers as you go.
 
When you have filled in all the spaces, re-read the text to check that the whole piece of writing makes sense.

Question 1Change answer

Holland tunnel
 
Once drivers enter the Holland Tunnel under the Hudson River in New York they are under strict control. They are not allowed to 1 tyres, do repairs, smoke, move 2 of line, blow their horns, 3 thirty-five miles an hour, or 4 the engine during a halt. 5 they run out of petrol 6 have a breakdown they will 7 fined. A staff of two  8 traffic police is employed to 9 sure that these regulations are  10. They see that all cars 11 steadily forward along the twenty-foot  12 roadway. Each officer stands within 13 of the next and behind  14 of them is a fire 15 and telephone. All are also 16 motor mechanics and firefighters. The 17 sitting at the main control 18 of the tunnel building can 19 at a glance if the 20 is streaming smoothly through the 21 and if the air contains 22 levels of carbon monoxide and  23 toxic gases emitted by the 24 of the thousands of vehicles  25 the tunnel every day.