there are usually l____of fish in very little water.this means that the water must be changedvery o_____

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there are usually l____of fish in very little water.this means that the water must be changedvery o_____

there are usually l____of fish in very little water.this means that the water must be changedvery o_____
there are usually l____of fish in very little water.this means that the water must be changed
very o_____

there are usually l____of fish in very little water.this means that the water must be changedvery o_____
lots,often
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lots ( lots of 许多)
often 经常