5. Dear Sir, Thank you for your letter of 8 September. We … the goods you requested
by courier.
a. 'll send – this is grammatically correct but in a formal business letter you use the full
form of 'will'
b. shall send – Correct – this is the correct form to use in a formal business
letter.
c. shall to send – Wrong – there is an extra word here.
d. will sent – Wrong – you need the base verb of 'sent' here.