10 друзей хотят провести шахматный турнир между собой. При этом каждый шахматист играет одну партию с остальными. Сколько партий будет проведено в этом турнире дайте полный ответ я ​

у глаголов в прошедшем времени окончания ed

m-ney,dad!

d-hello,marcus! are you enjoying your holiday in egypt?

m-oh,yes! i'm having a wonderful time.

d-1)have you been    to the valley of the kings yet?

m-no,l haven't.but l 2) have  already visited tne great pyramids.they were beautiful!

d-what else 3)did you so far?

4) walked

5)went

6)has already tried

7)hasn't seen

8) haven't visited

a book is more expensive than a newspaper.

a cream cake is more delicious than an apple pie.

an armchair is more comfortable than a chair.

a toaster is more economical than a microwave oven.

my room very beautiful. it very simple and convenient. in my room wall-paper of coffee colour. on a floor the light carpet, it very beautiful is established! on the middle the big window is established, it is with is left from a door. on the right there is a door. on-seridine rooms there is a sofa. it big and convenient, i on it have a rest. in a room there is a computer, it costs on a special little table for the computer, still there are many shelves in them there are my school accessories and my things. here such my room!