[ Grammar ]
3-D printing ____ complex tools and components.
A. is used for produce
B. is used to produce
C. uses for producing
D. uses to produce

Random Topics:
Demonstrative PronounDefinite ArticlesFuture Tense and ConditionalsWish / If only ( Present)Prepositions and Preposition PhrasesCommon & Proper NounsPresent simple or Past simplePronoun Antecedent AgreementEd and Ing EndingsGrammar & ReadingOther quiz:
Subject Verb Agreement and Coordinating Conjunctions › ViewChoose the correct verb form to complete the sentence: “The birds ______ singing early in the morning.”
A. start
B. starts
C. started
D. starting
Grammar › View
_______ electricity you use, _______ your bill will be.
A. More / higher
B. The most / the higher
C. The more / the high
D. The more / the higher
Phrasal Verbs › ViewMike hasn’t turned up yet. Do any of you know where is he?
A. Turn Up
B. Give Up
C. Turn Out
Past Tenses › View
to give a series of actions in the order that they happened
A. past simple
B. past continuous
