若实数a满足a2-2a=3,则3a2-6a-8的值为______.
∵a2-2a=3,∴3a2-6a-8=3(a2-2a)-8=3×3-8=1,∴3a2-6a-8的值为1.
My father wants me _______ shopping(购物) with him.
A.going
B.goes
C.go
D.to go
—Mr. Johnson, would you have some more ice-cream?
—No, thanks. It’s very good, but I have to ____________ my weight, you know.
A watch. B.remain C.notice D.see