参考答案1-5
ABCCB 6-10
ABABA 11-15
CBBAC 16-20
CBAAB21-25
ACBDD 26-30
CABDA 31-35
BCCAB 36-40
DADBC 41-45
ACDAB46
challenging 47
teachers 49
helpful 50
used 51
reading 53
usually 54
and 55
her→hers 57
twelve→twelfth 58
looks→look 59
in→on 60
photo→photos61
the most impoytant thing in life is friendship62
友谊意味着不孤独63
I had a day for sightseeing
我开始感到难过65
如果没有同伴分享，生活就索然无味66
One possible version：Li Hua is my good friend
I became friends with him two years ago
Li Hua is tall but a bit thin
He wears glasses
There’s a big smile on his face all the time
He studies hard and is strict with himself
He’s full of energy
You can often see him playing basketball
Once I was ill at home, He lived far away from my house but he came and helped me with my study
