[ Sentence Structure ]
Which of the following is a simple sentence?
A. The cat slept on the mat.
B. The cat slept on the mat, and the dog barked.
C. Although the cat slept on the mat, the dog barked.
D. The cat slept on the mat, and the dog barked when the mailman arrived.

Random Topics:
1st and 2nd ConditionalsAdverb of Frequency and Past Continuous TenseModals "Should"Verbs + Gerund or InfinitivePerfect and Past TensePresent Simple & ContinuesGrammar - PunctuationLinking WordsPresent Simple, Present Continuous or Present PerfectModals and Comparative SuperlativeOther quiz:
Would/would like - affirmative/negative › ViewWhen I make a lot of money, I _ to buy a house.
A. wouldn’t
B. would like
Grammar › View
What does should express?
A. A suggestion & advice
B. A responsibility
C. A strong obligation
Phrasal Verbs › ViewDo you _____________ in ghosts?
A. come
B. depend
C. believe
D. look
Vocabulary › View
deserted of people
A. Exile
B. Redemptive
C. Desolate
D. Prodigious