1. —Don't worry. You can leave it to me.
—Thanks. I'll be ________ you.
A. counting in B. counting on
C. counting down D. counting out
2£®When Bob woke up he found himself in hospital, but he didn't know how that ________.
A. came about B. came out
C. came along D. came across
3. ________ we can't remove our troubles in life for ever, we can leave them behind when we are on vacation.
A. When B. While C. Unless D. Until
4. —Danny£¬can you come and give me a hand?
—Sorry, dad. I'm________. Why not ask Jane?
A. occupied B. stuck
C. available D. accessible