Fill in the Modal verbs?

Question

The buddy game
Tomorrow there( 1. will) be an activity held by the Sai Wan Social Service Centre.It is the buddy game held in Sai Wan Plaza at 2p.m. over 120 pairs of friends (2.have) join.
What does it mean by the buddy game? The participants' hands (3 to) be tied and that means the two of them (4 will)have only three hands to use. In this game, the Sai Wan Social Service Centre aims to promote friendship among all ages. In the game, participate (5 have) possess compromise, understanding and cooperation among the two of them. They (6 are) work together and make good use of their hands. If they quarrel in the game, they (7will) certainly lose. Anyone interested (8 to) go and watch the competition. Admission is free.
Thanks!

Answer 1

Butterfly's answer was almost perfect. But you cannot say that somebody "might certainly" do something. It's a contradiction.

Here's my idea. There were some other mistakes in the text, which I have corrected (in brackets).

The buddy game.
Tomorrow there will be an activity held by the Sai Wan Social Service Centre. It is the buddy game, held in Sai Wan Plaza at 2p.m. Over 120 pairs of friends can join (in).

What (do we) mean by the buddy game?

The participants' hands must be tied and that means the two of them will have only three hands to use. In this game, the Sai Wan Social Service Centre aims to promote friendship among all ages. In the game, participants must possess compromise, understanding and cooperation among the two of them. They should work together and make good use of their hands. If they quarrel in the game, they will (almost) certainly lose. Anyone interested (in participating) should go and watch the competition. Admission is free.
Thanks!

Answer 2

The buddy game
Tomorrow there will be an activity held by the Sai Wan Social Service Centre. It is the buddy game held in Sai Wan Plaza at 2p.m. Over 120 pairs of friends can join.
What does it mean by the buddy game? The participants' hands must be tied and that means the two of them would have only three hands to use. In this game, the Sai Wan Social Service Centre aims to promote friendship among all ages. In the game, participatants must possess compromise, understanding and cooperation among the two of them. They must work together and make good use of their hands. If they quarrel in the game, they might certainly lose. Anyone interested may go and watch the competition. Admission is free.

Answer 3

will
have to
are to
will
have to
are to
will
to
hope dey r rite!!!