Rewrite the sentences, using the word in brackets, so that the meaning stays the same: 
1.  I put on ten kilos and then I decided to go on a diet.(by the time) 
    
2.  First, they washed the car and then they waxed it. (aft)    

3.  Lisa made a sandwich and then sat on the sofa to watch TV.   (before)     

4.  We packed our suitcases and then left for the airport.(as soon as)     

5.  The lecture started. Then I entered the lecture hall.(when)    

6.  I hadn't tasted Chinese food before.(first)     

7.  That was the only science-fiction book he had read.(never)    

8.  Norman took that package. Then he realized it was the wrong one.(after)    

9.  Mark was parking his car when he noticed the wing-mirror was broken.(While)    

10. Judy was walking down the street when she saw an accident.(As)     

11. I'm sorry I can't talk to you now. I'm going to work in a minute.(about to)     
12. The Council is going to close the old swimming pool.(intends)    

13. They are going to have a big wedding in the summer.(planning to)    

14. The economy will collapse in the very near future, it will happen at any time now. (on the point of)     

15. My grandfather is going to die soon. (about to)    

16. You will arrive at the hotel at 7.30 in the evening.  (due to)