Why did you quit your job?—It was goodsalary, but I didn’t like the working conditions

_____ by his wisdom and humor at their first meeting, the chairman immediately invited him to attend the coming Science conference [ ]

Leaving the door unlocked is an open _________ to burglars(夜盗).

ranger isn’t like a worker, nor _____a salesman

1— Where ___________ yourpen pals from— The UnitedStates.