I. Improve the following sentences. 1. I hereby acknowledge receipt of your July 7 letter. 2. Do send us your catalogue as soon as possible. 3. Unfortunately, your order cannot be sent until next week. 4. Your negligence in this matter caused the damage to the equipment. 5. Replying to your letter of August 3 we would state that we deem it a great pleasure to accept your kind offer to serve on the committee.