根据句义完成句中已给出首字母的单词。
小题1:Nobody taught her French . She learned it by h__________>
小题2:In the US, 13 is an u_________   number.
小题3:This new car b_____   to my brother. He bought it last week.
小题4:He spoke so fast that we couldn’t hear him c__________.
小题5:Here’s a card for you with our best w_________.