ACTOR Zachary Gordon, 14, is back as middle-schooler Greg Heffley in Diary of a Wimpy Kid: Dog Days. It’s the third film based on Jeff Kinney’s hit series, combining parts of the books The Last Straw and Dog Days. This time, Greg is determined to sleep in (睡懒觉) and play video games during his entire summer vacation. But his parents have other plans for him, like spending bonding (培养感情的) time with his father Frank (played by Steve Zahn) during a camping trip that goes wrong.