________by a group of children,the old man was delighted.
----Mary broke up with me!----You ______ have forgotten about the Valentine's Day.
Young people seem to have no time to spend with other people around them ______ giving so much attention to their own world.
One of the requirements for the experiment is that the material _____ to its burning temperature.
---- Occasions are rare _____ I can spend a day with my daughter. ---- You should spare some time to accompany her.
I will never understand how it ______ that you failed in the examination for you are such a good student.