[ Tenses ]
The equipment ______ by the technician before it can be used for the experiment.
A. must be checked
B. must have checked
C. must check
D. must be checking

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Pronouns, Sentence Structure, and Figurative LanguageSports VocabularyOn, At, ByComparison of Adjectives and AdverbsAdverbs of Manner, Likes and PreferencesPast and Past ContinuousToo or EnoughPrepositions & Modal VerbsHas and HaveComparativesOther quiz:
Vocabulary Spelling Grammar › ViewFind the correct spelling.
A. retaok
B. redake
C. retak
D. retake
Grammar › View
I’ve walked ten kilometres. My _____ hurt.
A. feet
B. foots
C. footes
