Steve, don’t do eye exercises with your eyes _________.— Sorry, I won’t.

You don’t know what great difficulty I had _____ to get the two tickets.—- But the film is really worth_______ twice.

____ Helen’s knowledge and vocabulary expanded, sheasked more and more questions.

下列各句中，没有语病的一句是

To improve the quality of our products, we asked for suggestions ________ had used the products.[ ]