swim ( ) the river 是填across还是through?

swim across the river还是swim cross the river? swim ( ) the river 是填across还是through? Let's _____in the river.是swim还是swimming Can you swim in the river Are they---------(swim)in the river now? They (swim;are swimming)in the river Many boys___(swim)in the river now Look!They___(swim)in the river can you swim 空the river she can swim ---(cross)the river. He often______(swim) in the river what about swim in the river? Look! The students________(swim) inthe river He can swim a_____ the river safely . A chicken -------------swim in the river let's (swim) in the river把swim替换掉 swim in the water为什么不用a a 可以用么说错了是 swim in the river don't go for a____(swim)in the river whithout an adult 是加swim还是加swiming?