Try again, maybe you will come up with a better idea.  {#blank#}2{#/blank#}             

It's a chicken-and-egg question. I can't answer you now. {#blank#}3{#/blank#}
A. easy 13. clear C. difficult D. funny
Come and join us. We are short of hands. {#blank#}4{#/blank#}

--Dad, did you tell mother about our gift for her birthday? --No. Don't let the cat out of the bag. Let's give her a surprise{#blank#}5{#/blank#}

- He is         his report in the room. He needs it for a meeting.

— Sorry, I didn't ____ what she said.

—So the audience that attend Jay Chou's concerts are mainly ________ young people.

— I like collecting train tickets, and I have a collection of 100 ______________ now.