Which verb can complete the sentence: "The same symptoms that occur __________occur with cocaine"?

With amphetamines can-immediately, we identify two main verbs. First, there is the connector that at the center of the whole idea. The following word the a verb - occur. also, there is another verb - occur after the blank. Wecan safely say that everything before the connector that is the main subject.

Therefore, we can anticipate a possible second subject for the second verb, or possible another connector.