[ Infinitives and ING Forms ]
He suggestted … the technology for other forms to transport.
A. to use
B. using
C. to use or using

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Subjective and Objective PronounFuture FormsNouns and QuantifiersLinking WordsModals "Should"Positive and Negative ConnotationsGerund or InfinitiveModal, Causative Verb & Elliptical StructureHave toQuantifiers and AdjectivesOther quiz:
Past Tenses › ViewI finished my homework before dinner.
A. Past Simple
B. Past Continuous
C. Past Perfect
Modals › View
I ___________ swim very well when I was younger.
A. could
B. should
C. must
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Vocabulary › Viewthe office or function of an agent
A. brother-in-law
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Grammar › View
I closed the window ___ it was cold.
a. so
b. because