一个质量为1kg的物体，t=0时初速度为零，在2N的合力作用下沿x轴正方向运动，1s后再增加一个大小也为2N、方向沿y轴正方向的力，则该物体在2s末的速度大小为______ m/s，前2s内的位移为______m．

根据句意及首字母，写出下列单词的正确形式。

1．There are seven s___________on the hill.

2．We can see many a_____________in the zoo.

3．Look at the b____________and listen to the teacher.

4．There aren' t any boats on the r__________.

5．My p____________are at home. They love me.

6．— What' s his a_____________? — It's No.26 Changzheng Street.

7．My parents often t____________me to the zoo.

8．W____________to our home. Come in, please.

9．This is my c____________and it has a mouse.

10．Some money is in my p_____________.