分解因式x2-a2-2x-2a=______.
原式=(x+a)(x-a)-2(x+a)
=(x+a)(x-a-2).
故答案为:(x+a)(x-a-2).
Let's put a flower _____________ yes.[ ]
A. to
B. at
C. on
D. for
Susan Jones was at the bus stop well on time to take the 7:01 bus, but she had to miss her breakfast to do it.
A.catch up with
B.catch
C.run up to
D.be catching