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:
Tenses › ViewIn which tense do we use the structure ‘Subject + Be Verb + Verb(-ing)’ for past actions that were interrupted?
A. Present Continuous Tense
B. Past Perfect Tense
C. Simple Past Tense
D. Past Perfect Continuous Tense
Vocabulary › View
urge
A. made possible
B. to try hard to persuade
C. extremely tired
D. to take care of; to keep in good condition
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