I like taking a walk ______ the river after dinner．（　　）

Trust______． You can do much better than you think．（　　）

We usually have a seven______holiday every National Day．（　　）

﹣I am terribly sorry，______I can't go shopping with you this afternoon．

﹣It's OK． We can go next time．（　　）

He is afraid of high places，so he ______ travels by air．（　　）