Viết lại câu

Viết lại câu (sử dụng câu điều kiện tổng hợp)
1.They used closed-circut television.That's how they spotted the shop-lifter
2.They asked him to leave the dining-room because he wasn't wearing a shirt
3.It took us a long time to find his house because the streets were not clearly marked
4.We didn't go by air only because we hadn't enough money
5.The bus didn't stop because you didn't put your hand up