Помогите пожалуйста , необходимо поставить правильное слово: He turned and looked

Помогите пожалуйста , необходимо поставить правильное слово:
He turned and looked (after\at) us before he laft the room . The bike will serve longer if you look well (after\through ) it . The police were looking (for\through) a dangerous criminal in our neighbourhood . I havent read the book ive just looked (forward to \ through) it . They are looking (at\for) a new computer programmes for their office . he had worked hard and was looking (for \ forward to ) a long holiday If you want to go away ? i can look (after\for) your garden . I looked (at\through) the sky it was threatening with rain .