Someone who lacks staying power and perseverance is unlikely to ___ a good researcher. 

Don’t _______the day you stop suffering, because when it comes you’ll be dead.

In our class, girl students _____ nearly 60% of the students, and most of them study very well.

In all kinds of competitions, Jackie ______ a most excellent athlete. He has won so many golden medals.

---There is something wrong with my watch, will you    ? ---Let e see.