Choose three more sentences that use the wrong past tense:

2 At first, the agency was not believing that the machine would save so much time.
3 I was planning to visit the International Inventors' Fair but I did not have time.
4 The story goes that Professor Auenberg was having the idea for the electric shoebrush while he was washing up.
5 They failed to see the gap in the market and so missed a unique opportunity.
6 Z40, the new drug developed by Pharmatek, marked a breakthrough in the treatment of cancer.
7 Zirkon already made good profits when it introduced its new digital camera in 2010.
8 Last year, we spent a lot on marketing and so attracted a lot of new customers.