Model The room is 15 metres long The room is 15 metres (in)

Model The room is 15 metres long The room is 15 metres (in) (length)
1 The Eiffel Tower weighs about 700 tons
The Eiffel Tower is about 700 tons( ) ( )
2 He did not ask the teacher for help.He worked out the different problem
He worked out the different problem（ ）the help of the teacher
3 In ancient China,people used the Great Wall to keep the enemies out of the country.
In ancient China,people used the Great Wall to ( )their country from enemies
4 It took the workers ten years to build the palace
The workers ( ) ( ) the palace for ten years