Professor Martin is best known for his work on bonding of main group elements.

Professor Martin made a quick examination of her hand.

Professor Martin might spot the substitution if he looked at this figure closely.

I believe not, though Professor Martin went directly to bed.

Old Professor Martin struggled to his feet and turned to her.

"Our work will be put back weeks," Professor Martin worried.

And it was true of Professor Martin as well.

When she returned to the living room she met Professor Martin.

I'd better go down and see what is bothering Professor Martin.

Professor Martin seemed to have frozen on the steps.