根据对话选词填空。

JENNY: Nick, we____go to bed. It's very late.
NICK: I know, but I ____ help Trig than go to bed. He's tearing up his English exercise book and he's throwing his grammar book round the room. I don't think he's very happy.
JENNY: Well, you ____stay up too long.
NICK: Trig, stop it. You ____ throw your books at the wall. It won't help and you might break something. You ____work at your English now. What are you learning?
TRIG: Abbreviation n 1 U abbreviating, being abbreviated 2 C shortened form of a word, phrase, etc. "Sept" an abbreviation for "September"…
NICK: But Trig, that’s from the dictionary. You ____  learn the whole dictionary by heart!

美国宇航局的好奇号火星探测器是美国第四个火星探测器，其使命是探寻火星上的生命元素．2011年11月26日10时2分（西五区时间），好奇号火星探测器发射成功，顺利进入飞往火星的轨道．2012年8月6日成功降落在火星表面，展开为期两年的火星探测任务．根据材料回答下题．

（Ⅰ）求sinα，cosα的值；

（Ⅱ）求 $\frac{2\cos \left(\frac{\pi }{2}-\alpha \right)-\cos \left(\pi +\alpha \right)}{2\sin \left(\pi -\alpha \right)}$ 的值．

针对以下四幅图，下列说法正确的是（　　）

北伐战争开始后，主要战场在（   ）
①湖北  ②湖南  ③ 江西  ④上海