Exercise
Mark the following sentences correct or incorrect.

1. Last night I tried to call to CFO to discuss the currency fluctuations.
2. Last night I tried to call CFO to discuss the currency fluctuations.
   
   
3. Please call to 767 878 989.
4. Please call 767 878 989.
   
   
5. Please call me on 878 767 656.
6. Please call me with number 878 767 656.
   
   
7. This process is called as nitrogen fixation.
8. This process is called nitrogen fixation.

Answers:
Correct: 2,4,5,8
Incorrect: 1,3,6,7