Do you think that Pepsi Cola is better (then/than) Coca Cola?
than Than is a conjunction used to compare two things. Then is usually an adverb indicating time.)
(Their/There/They're) dog is over (there/their/they're) digging through the trash. (They’re/There/They're) not the most responsible pet owners.
Their/there/they're (Their is a pronoun that is plural possessive. There is a word that means place. They’re is a contraction that means they are.)
Too many times, students go to their adviser to set up their classes, but only have two of their five classes picked out.
Too/to/to/two (To is a preposition indicating direction. Too is an adverb meaning in addition or also. Two is a number.)
Students (that/which) fail to thoroughly proofread often miss unnecessary points
That is used when the phrase or clause that follows it is necessary in the sentence. Which is used when the phrase or clause that follows it is not necessary
In school, students are prohibited from having (illicit/elicit) items such as drugs, alcohol and weapons.
illicit (elicit often mean ‘to get something’. Illicit, on the other hand, describes something illegal.)
