Please Proodread the following sentences:
8) Welcome abroad. Let's hear the announcement.
9) I am writing to inform you that your application to the post of General Manager in our company is unsuccessful.
10) Don't open the window. Don't open the door, too.
11) She is not only diligent but smart.
12) We can insure you that this incident will not happen again.
13) If you would like to enroll on the course, please complete the form.