It was only after he had read the papers ________ Mr. Gross realized the task before him was extremely difficult to complete.

Such habits as smoking and cheating，once ________，are hard to get rid of[ ]

You are nice in this dress.—____

If only I _____ a few days ago！Then I wouldn’t have beenfeeling so worried now.

If we work with a strong will, we can overcome any difficulty, ____ great it is [ ]