[ Grammar ]
Most advanced aircrafts now —- at supersonic speeds.
A. could have fly
B. are able to fly
C. had to fly
D. were supposed to fly

Random Topics:
AbilityModal, Causative Verb & Elliptical StructureShould, Should not haveConjunctions in Complex SentencesModals, Infinitives and GerundsGrammar - Compound SentencesUnderstanding Product Packaging and TensesPerfect TenseFuture Simple TensesAdverb PhrasesOther quiz:
Tenses › ViewI got the plane tickets. I ………………………………………. (fly) on Sunday.
A. will fly
B. am going to fly
C. am flying
D. fly
Vocabulary and Grammar › View
the remaining earnings after deducting expenses except for tax
A. profit margin
B. Net profit
C. pre-tax profit
D. Net profit margin
Grammar › ViewBefore I went to bed, I (lie, lay, laid) my clothes out for the morning.
A. laid
B. lay
C. lie
Grammar › View
‘I’m doing my homework a the moment.’
He said that he ……….. at the moment.
A. Done his homework
B. has been doing his homework
C. was doing his homework
