They went out of their way ___________ that big problem.
A：to solve
B：solve
C：solving
D：to solving
The place is very popular. Look, there are so many _______ here.
矩形具有而一般平行四边形不具有的性质是（ ）。
给下列划线字注音或根据拼音写汉字。
____
山涧
默契
田垄
挚痛
亘古
镐头
huì
làn
dàn
lán
háo
污____
泛____
怪____
斑____
____鸣
____语
