Please be careful ______ your study ______ now on.
---It’s nice day, isn’t it?---Yes, what fine weather!
Jimmy is _____one-year-old boy and he has _____8-year-old sister.
I ______ it everywhere, but I didn’t ______ it.
He often practice with his teacher.
There are so many kinds of pens in the shop ,I can’t decide __.