. It _____ Mary and Tom that often helped me at school.
Our foreign English teacher always ___ us students how to get to know about the culture and customs of foreign countries.
—What do you think of the man you have just interviewed?—He gave me a(an) ___ that he was not very ___ about the job.
I’ve always been very ___ about giving my address and telephone number to strangers.
I waved to Nancy, but she was ___ in her thoughts, and made no response.
I have tried to solve the problem, but it is so difficult that it ___ not only me but also my friend.