Nelson Mandela, former president of South Africa, devoted himself        to making the black and white equal.

－If I’m not mistaken, your birthday is coming up. Has your brother sent you anything?－Not yet. He never forgets, _________.

Since Tom ___downloaded a virus into his computer, he can not open the file now．

This is only a solution that can be adopted to solve the problem       , so you have to find a better way.

—I’ll talk to my son Bill about it as soon as possible． He usually listens．—We need _______ listening． We need action．