New words：

prank [præŋk] n.恶作剧；玩笑
April fool's day 愚人节

Sample Sentences：

Those schoolboys like to play pranks on their teachers.
On April fool's day people often play pranks on each other.

New words：

tourney ['tʊrni] n.锦标赛
tournament ['tuənəmənt] n.锦标赛

Sample Sentences：

His victory in the tourney earned him$ 50 000.
The number two seed is safely through to the second round of the tournament.
We produced the best soccer of the tournament. Nobody would argue with that.

New words：

overturn /ˌoʊvərˈtɜːrn/ v.倾覆；翻倒；翻掉；推翻

Sample Sentences：

She overturned the bottle.
The boat overturned but didn't sank.
The vase overturned and crashed into pieces.
The building was overturned at the earthquake.

New words：

contour ['kɔntur] n. 轮廓；外形
coastline ['kəustlain] n. 海岸线

Sample Sentences：

The contour of that mountain looks like a dragon.
The road follows the natural contours of the coastline.
Some people in California were warned to avoid the coastline for 12 hours.

New words：

detour ['di:tuə]
v.绕道
n.弯路；绕行道

Sample Sentences：

Detour. Road under repair.
They made a detour to avoid the town center.
During the construction we had to take a detour.