Theo other answer is incorrect, the first blank is undulate and the second is oscillate
Undulate is to rise and fall like waves and oscillate is to swing back and forth.
After sailboat before and hope this help
A central idea is focusing on informational texts, while themes are a life lesson that an author wants you to take away after finishing their story. =)
either 2 and 3 or 1 and 3
what helps support the claim .
