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根据汉语完成下列句子。 1. 他看见外星人走进一家纪念品店。 He saw the alien ___________ ___________ a souvenir shop. 2. 昨天这时你在干什么? What ___________ you ___________ ___________ ___________ ___________yesterday? 3. 当他母亲进来时,他正在玩电脑游戏。 He ___________ ___________computer games when his mother ___________ ___________. 4. 我跟着它看它朝哪儿去。 I ___________ it ___________ ___________where it was going.