写出下列句子的同义句。
1. My pan pal is from Canada.
My pan pal ______ ______ Canada.
2. My sister wouldn't like to drink tea.
My sister ______ ______ to drink tea.
3. Lucy and Lily look the same.
Lucy ______ ______ Lily.
4. Our school has fifteen classes.
______ ______ fifteen classes ______ our school?
5. How was the weather last weekend?
______ was the weather ______ last weekend?
6. All of us like playing football.
______ ______ like playing football.
7. They gave her an English book.
They gave an English book ______ ______.
8. What do you think of sitcom?
______ ______ ______ like sitcom?
9. She did nothing this afternoon.
She ______ ______ ______ this afternoon.
10. I found that he was singing in the next room.
I found ______ ______ in the next room.
有相同的秩，且β3可由α1，α2，α3线性表出，求a，b的值．