小题1:My uncle enjoys __________(skate) but he likes playing chess better.

小题2:Let’s have a coke, and then go __________(fish) somewhere by the river.

小题3:_________ Mike __________(do) his homework every day?

小题4: Would you like __________(plant) some potatoes with me?

小题5:Millie, __________(not talk) in class.

小题6:It’s time for me __________(have) an English class.

小题7:We can __________(sing) many English songs now.

小题8: __________(be) your mother at home on Sundays?

小题9:The boy with his classmates __________(study) English at school every Monday.

小题10:It takes her about an hour __________(help) them clean the room.

如下图所示，跷跷板AB的一端B碰到地面时，AB与地面的夹角为18°，且OA=OB=2m

（1）求此时另一端A离地面的距离（精确到0.1m）；

（2）跷动AB，使端点A碰到地面，画出点A运动的路线（写出作法，保留作图痕迹），并求出端点A运动路线的长（结果含π）．

（参考数据：sin18°≈0.31，cos18°≈0.95）