[ Vocabulary ]
parts of your body that work together to fight disease
A. immune system
B. infect
C. protect
D. symptom

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Take or PutArticlePresent Perfect SimpleModals and VocabularySentence Fragments and Complete SentencesRelative ClauseFirst ConditionalsGerunds/InfinitivesIndependent and Dependent ClausesPersonal PronounOther quiz:
Present Tenses › ViewAdam ………… a book about wild animals now.
A. reads
B. is reading
C. read
D. are reading
Grammar › View
______ bought a new computer.
A. We
B. Us
C. Ourselves