—I have to ask a(n) _____ of you because the luggage is too heavy for me.—Oh, with pleasure.

Monkeys in the zoo started to show the flu _____ last Monday and altogether twenty have died up to now．

 “Can I take your        now?”said the waiter.

Your _____ as a student will be excellent if you develop a habit of reflecting on how you learn.

It’s obvious that his ______ to the problem is wrong, so we’d better try another way to solve it.