800+700=____
1200-300=____
1800-900=____
300+1000=____
400+500=____
180-80=____
400+600=____
90+30=____
5000-3000=____
300+700=____
下列河流中汛期最长的是 ( )
你觉得课文《一封奇怪的信》中的小姑娘是一个什么样的小女孩?
The South Korean television series The descendants of the Sun reached a wide a____(观众).
They need two _________ for their music club.