[ Subject-Verb Agreement ]
There (is, are) two classes of pure matter: elements and compounds.
A. Is
B. Are

Random Topics:
Tenses (Present, Past, Future Forms)So....that... Such.......thatConditional Sentences and AdverbsModals, Phrasal Verbs, Gerunds and InfinitivesModals Deduction: cant /mustGerunds and InfinitivesBe Going To vs. WillParticiple AdjectivesVerbs, Tenses, and VocabularyModal Verbs and Gender NounsOther quiz:
Vocabulary and Grammar › ViewIdentify the correct sentence that uses the past continuous tense:
A. She was studying for her exam last night.
B. She will study for her exam last night.
C. She is studying for her exam last night.
D. She studied for her exam last night.
Passive with Modals › View
The application __________ carefully before any decisions are made.
A. is considered
B. must be considered
C. was considered
D. will consider