I can’t help_________if my students are always making any noise in class.
______ make her father angry, Joan didn’t tell him her poor grade.
Samuel Clemens,______ Mark Twain, wrote many popular stories.
The old man used _____ in front of his house and he has got used to _______ like that.
Mr. Brown, ______ chairman of the trade union, will visit our factory in _____ month of May.
He has called several times this morning, ____ there is something very urgent.