Choose the correct option a-c to complete the sentences 1. How

Choose the correct option a-c to complete the sentences 1. How long .......in sales?
a) do you work b) have you been working c) were you working
2. By the time I came back from my business trip, a lot of things ....... .
a) had changed b) has changed c) changed
3. The company is huge. It........ a thousand new jobs since the beginning of last year. a) created b) has created c) had created
4. We ....... this product since the beginning of the year. a) have produced b) have been producing c) had produced
5. I'm afraid the company is going bankrupt. It ........big problems lately. a) had b) has had c) was having
6. So, what ........ since I last saw you? What's new'? a) have you been doing b) did you do c) were you doing
7. The number of employees cycling to work......... a) increased b) have increased c) has increased 8. Mary left work very late. She........letters all day. a) was typing b) has been typing c) had been typing