e taughthundreds of students,___________ having been working in their fields for years

He was unable to make such progress,__________________.

12. He gave us a nod and muttered a “yes”after _______ seemed like hours.

I think Paul is __________ a careful person that he seldom makes mistakes.——But this time he did. He was __________ nervous that he made a tiny mistake.

Can I have a look at other jewels before I make adecision— Certainly ________，Madam