Can you check these sentences?

I'll really appreciate your help. Hehe I know there are a lot of mistakes, help me, please

1. Jane is the manager’s receptionist. She usually works on her computer at 10 o’clock. She’s typing a letter at the moment. She is always very busy.
2. What foreign firms are interested in buying our benches?
3. Petrov knows more foreign languages than other employees of our firm.
4. Recently, we’ve received a lot of information from the Sellers regarding the pumps of Model B and not so much about Model 3B.
5. The director told us to hold a meeting this week.
6. Let’s meet two days later. I’m working hard tomorrow and the day after. Do you agree?
7. The firm could provide means of transportation and offered the goods at CIF terms.
8. We have been buying equipment in this firm for a year and a half.
9. -I rang you at 3 o’clock but you were absent. Where were you?
-We were discussing the offer regarding new equipment from one English firm.
10. Let Mr. Blake tell us about his trip to Germany.
11. Our phoned Mr. Clark and held a meeting on Friday.
12. When we’ve discussed the price we’ll talk about the payment conditions.
13. Ask Mr. Brown if he’ll go to the airport to meet representatives of the Japanese firm.
14. If you want to get there fast go to the tube on Vladimirskaya. You’ll need to change the train on the Technical Institute station. Exit on the Moscow’s Gates station.
15. Some goods offered by the firm meet the reservers’ requirements but others are not of high quality.
16. Voronin and Smith met each other on Monday and started negotiations. The Russian company decided to set up 100 lifts.
17. The administrator of the hotel made me fill in a blank. Then he gave me a key from my room.
18. -Is anybody in office?
-No. Everybody has gone home.
19. -When can you deliver the first party?
-Not later than in July.
-Can you deliver the goods earlier?
-I’m sorry but we have a lot of
20. As all my things weren’t liable to tax, I needed some time to pass through the customhouse