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

of the good results of the exam, the teacherfelt very happy.

－Do you know _______ World Water Dayis－On March 22nd.

The old woman __________ her son and daughters _______ and see her from time to time.

(2012·福建)We promise ________ attends the party a chance to have a photo taken with the movie star.