My teacher’s words had a great _____ my studying science at college.

We believe there is a strong ______ that they will fly to Guangzhou next week.

I’ve listened to Professor Smith’s talk about medicine,but I still haven’t got a good understanding of its key _________.

 His name is on the _______ of my tongue, but I just couldn’t remember it.

I saw Mary dancing at the party and on such ______ she was really excellent.