We are invited to a party __________in our club next Friday.

______ from the top of the tower, the south foot of the mountain is a sea of trees. 

 Unless ________ to answer questions, the pupils won't talk in Mrs Smith's class.

When I came in，I saw her ________ in the sofa ________ in thought．

              so various views about the matter,it is hard for him to make a decision.