***** NOT A TEACHER *****
Good morning, Teacher Dimpap
I have found something in a scholarly work that may interest you.
1. I think it a pity to waste them.
I think it is / would be a pity to waste them.
2. The scholar says that the "commonest" verbs used in such sentences are:
take ( = suppose, think)
3. The information above comes from that book. The following are only my thoughts:
a. "I thought it strange working at such late hours" is either more formal or informal than "I thought it was strange working at such late hours." I daren't make a guess. Let's see what the teachers say.
b. I think that it is accurate to conclude that some of those verbs in that list would not fit in your sentence, although some would:
"I considered/ felt/ found it strange working at such late hours."
REFERENCE: A. S. Hornby, A Guide to Patterns And Usage in English. I have the tenth impression 1966. First published in 1954. Printed in Great Britain at the University Press, Oxford, by Vivian Ridler, Printer to the University.
As a teacher, you might find this book to be indispensable in many ways. I have no idea as to its present availability.
P.S. Here is another choice mentioned by the scholar:
a. We all consider it wrong to cheat in examinations.
b. We all consider that it is wrong to cheat in examinations. (I believe that Americans prefer "on examinations.")