Заполните пропуски в предложениях соответствующими союзными словами: who, that, which, when, where, why, how... The manager’s

The manager’s report showed that our company had had a very difficult year. The report revealed the reasons why our company had lost its major customers. Our profits went down steadily from June to October when we sold only 50% of our products. Mr. Black who heads the Marketing Department informed us about their research results. The drop of sales which can be explained by the global crisis was dramatic.