用括号内所给词的适当形式填空。

1. Mary happened to meet one of her old friends and invited him ____ (go) to her new house.

2. They are getting ____ (marry) next month, so they are very excited now.

3. You will feel unhappy when someone ____ (smile) at you in a strange place.

4. Mr. Smith seems to be ____ (please) with the new student called John.

5. The lights are off. I think there was nobody ____ (leave).

如图所示，湖中一条小船，岸边有人用缆绳跨过一定滑轮拉船靠岸，若绳子被以恒定速度v拉动，绳与水平方向成α角时，小船前进的瞬时速度为______；因此，小船将______速靠岸（填“加”、“减”或“匀”）．