tried phoning her office, but I couldn’t _______. 

An early typewriter produced letters quickly and neatly; the typist, _____ couldn't see his work on his machine.

Hearing the disappointing news, he was too sad to ____himself．

Yao Ming is generally ________ as the best basketball player in the world.

 He has five___________ , and they are all doctors working in the same hospital .