We take this opportunity to express our sincere of your timely help.
—How far can you run without stopping?—________.I've never tried.
—Would you mind answering some questions on shopping habits?—________.
Whatever he does,once he sets up a goal,he will start pursuing it without ________.
As is well-known,the brain performs a very important ________,which controls the nerve system of the body.
—What do you think of the project put forward by the Blacks?—Considering its real ________,it will be well worth putting into practice,I suppose.