---Could you help me take care of my pet dog on the 19th?--- I’m afraid I’m not that day.
You can’t imagine the difficulty he ________ onto the cliff and saving the boy in trouble.
—Does Lisa have a new hairstyle?—Yes.In fact,it is quite similar ________yours.
________with the size of the whole earth,the biggest ocean does not seem big at all.
We should consider the students’ request ________ the school library provide more books on popular science.
I believe the teacher's explanation will ________this puzzling problem.