It is a long time since I last saw you .This sentence means _______

I could just see a car in the distance, but I couldn’t _____ what color it was.

The two girls are so like strangers find_____difficult to tell one from the other.[ ]

.Mr.Smith was_________ to be a doctor but he became a teacher when he grew up.

It is said that Mr Jin was electedheadmaster of the new school.— He is _____ hardworking that it is nosurprise for him to get ______ post.