The plan for the new design occurred to Mr. Smith______on his work recently.

1. A.
   while concentrated
2. B.
   while concentrating
3. C.
   while he concentrated
4. D.
   while concentrating himself

for work. Now several month later, I still hadn't found　　　　　　 2.——

the job I was interested in. I received a call from a　　    　　  　　3.——

man calling himself Mr. Smith on last Sunday morning.　　   　　4.——

He said to me on the phone, “I heard you did too well　　　　 　　   　　5.——

at your studies. I may have a job for you.”　　　　　　　　  　　  　　6.——

I entered his office with a beaten heart. How I hoped  　　  　　　　7.——

that I will go through the job-hunting talk and he　　　　 　　   　　8.——

would take me on as a lab assistant. But to his surprise,　　     　　9.——

what he said disappointing. He only needed a model.　　　　   　　10.——