Nối hai câu dưới đây , dùng liên từ “ and / but/ or/ so” để tạo thành một câu ghép

3, It is raining hard, so we postpone our boat trip.

4, He dreams of being the best student, but he never studies hard .

5, My bicycle is broken, so I have to take the bus to school .

6, He is a brilliant doctor,  and loving father .

7, I need to tidy my room ,  or my mother will be angry with me . 

8, My house is quite old , but living in it is comfortable .