How careless of you to leave the knife on the floor.
The rain makes it impossible for us to go out.
It is dangerous to have a shower after 10pm.

Ta có:

`AB=AC-BC=5-3=2(cm)`

`CD=AD-AC=7-5=2(cm)`

Vậy `AB=CD` `(=2cm)`

working- working

have - be

receiving - being paid

studying to working

to be

working