Look! There's a monkey ____ (jump) up the tree.
如图,在□ABCD中,已知∠ODA=90°,AC=10cm,BD=6cm,则BC的长为( )
——We can't get good grades ______ we study harder.——I agree. That's why I study so hard.
把句子写完整。
①____真美啊!
②我们____。
③我和____是____。