The box is too heavy for me _________.
—Could you tell me____?—Sorry,I have no idea.
—The problem is too difficult,can you show me _____,Wang Le?—Sure.
—What do you think of Ann?—Ann is so careful that she always goes over her exercises to ______ there are no mistakes.
—_____will your sister be back ?—In about two hours.
—Please don’t touch that fish.It smells _______.—OK,I won’t.