填空题

This report makes some recommendations for a company planning to buy new computers. It is well organised, concise and relevant. But it contains several mistakes in grammar and spelling which are underlined. Correct the mistakes.
To: Said Kamal
Re: New computers
The aim of this report is presenting (to present) the best 2 choose for the company in replacing its computers in the central administration offices. Following some 3 initially research, we narrowed the field down to three possibilities:
The first, DX590, is the 4 more expensive of the three, 5 with a cost of $590 per unit. However, it is the most 6 powerfull and adaptable. The second, the HS Venturer, is a little cheaper to purchase, at $555, but has a smaller hard disk capacity and a slower processor. The third, the Songsing AF100, is 7 the bargain at $480 and has similar specifications to the HS Venturer. However, Songsing is a relatively new company and thus it is difficult 8 getting references for the product.
9 The another very important factor is the after-sales package. 10 Every three companies offer between 1 and 3-year service 11 garantees, but on slightly different terms and at different prices. The best of these is the DX590’s two-year warranty, 12 that is an on-site 24-hour repair service.
In conclusion, we recommend 13 to purchase the DX590. The HS Venturer offers much less for a similar price, while the Songsing AF100 is probably too risky, because it has 14 any track record. With good service back-up, the DX590 15 can also prove to be the most economical 16 on the long run.