The correct option to fill in the blank is **a. Jacksons**.
The sentence would read: "Do the Jacksons come to the party?" This is because "Jacksons" refers to a family or members of the Jackson family.
The most appropriate word to complete the sentence "There were three boats on the ..................." is:
c. river
So the complete sentence would be: "There were three boats on the river."
The most appropriate word to fill in the blank, given the context provided in the sentence, is:
a. boring
So the complete sentence would read: "This film is very boring! Can we go out and play football?"