1.If he doesn't work

=> Unless .........he works harder,he'll lose his job hared,he'll lose his job
2. I have never been here before
=> It is the first........time i have been here
3. you have read this novel, haven't you?
=> Have you......read this novel?
4. It was raining hard , so we had to cancel the game
=> We had to cancel the game because It was raining hard
5.Is's very wonderful to spend the weekend in the countryside
=> spending........the weekend in the countryside is very wonderful