______ the pressure gauge and the temperature gauge are crucial for safe operations.
A. Both
B. Either
C. Neither
D. None

Random Topics:
Present Perfect Simple and ContinuousGrammar - First ConditionalPast Simple Negative & QuestionsMixed TensesModal Verbs and Gender NounsHave toTenses, Determiners & Subject Verb AgreementVerb-ing or to VerbPassive Modals, Impersonal PassiveModal PerfectOther quiz:
Modals › ViewA: Hopefully, Peter booked the tickets for us yesterday.
B: He ——- them yesterday. The booking office is closed on Saturdays.
A: Oh well, I’m sure he’ll order them tomorrow then.
A. had better not book
B. hasn’t booked
C. couldn’t have booked
D. needn’t have booked
E. wasn’t supposed to book
Grammar › View
I _______________ a purse on the ground just now.
A. find
B. finds
C. found
D. am finding
TOEFL Grammar › ViewChoose the sentence with the correct grammar.
A. He classify those pens into different colors.
B. I will classify these species into different groups.
C. I will classified these species into different group.
D. He classifying those pens into different colors.
Grammar › View
An elephant is _______ than a buffalo.
A. large
B. larger
C. largest
D. as large as
