(what-why -which-where) hydro-electric power advantageous?
the new road (moved-went-arrived-reached)a length of 200 k
Braille used a system of raised (points-dots-lines-sides) to allow blind people to read
we took (in-up-after-on) alot of employees this year
Dr.Ramy works as a (visitor-visit-visiting-visited) professor