Привет друзья!Помогите с заданием по британскому языку!Choose the correct option a-c

Привет друзья!Помогите с заданием по английскому языку!
Choose the correct option a-c to complete the sentences.


1. I.......emails all day. I'm exhausted.


a) have written


b) have been writing


c) am writing



2. The company is huge. It.........a thousand new jobs since the beginning of last year.

a) created b) is creating c) has created
3. I......... to call you all day. Why didn't you answer the phone?
a) have been trying b) am trying c) was trying
4. The manager ...... our branch office three times so far this year.
a) visited b) has visited c) had visited
5. So, what ........ since I last saw you? What's new?
a) have you been doing b) did you do c) were you doing
6. By the end of the month I ......... this project.
a) will finish b) will have finished c) finish