根据句意,补全句中拼写不完整的单词（每空只填一个字母）
1.We had a lot of f_n at the party.
2.S_pt_mb_r is the ninth month of the year.
3.In China ,the last name is the g_v_n name.
4.What's the d_ff_r_ncebetween the two rooms?
5.It's_mp_rt_nt to learn English weii.