ПОМОГИТЕ ПОЖАЛУЙСТА!!! Заранее спасибо!!!ПОМОГИТЕ ПОЖАЛУЙСТА!!! Вставьте соответствующие предлоги в следующие предложения:
1) We have received your check …$ 2,000 enclosed…your letter…the 15th June.
2) We are grateful…your letter…yesterday’s date…which you sent us your catalogue…office furniture.
3) We confirm…this letter our telephone conversation concerning the time…our delegation visit…Greece.
4) I wish to thank you most sincerely…your kind letter informing…the visit…your company.
5) I am most grateful…you…the invitation…the reception…the occasion…the official opening…the International Trade Fair. 
6) It is a great pleasure to receive your letter enquiring…the details…a new model…computer. We have pleasure…sending you the latest catalog…your study.