Điền từ vào chỗ trống sao cho thích hợp và đúng thì

Friendship is very important to us. We all need (13) ______ in our life. We play (14)_____ them, talk to them and do so many other good things. Friendship makes us (15) _____ and strong. When we are sad, friends are always there _________ (16) us. Without (17)______, we will be lonely. It fills the loneliness and makes life worth. Friendship can form between anyone. Sometimes, men and animals seem to be good friends. They love and care for each other. We should respect our friendship and love our friends. In the end, (18) _______ of us needs a friend.
15.A. happily B. sadly C. happy D. sad
16.A. help B. to help C. helping D. helped