[ Preposition ]
They are worried ___ the future.
A. of
B. on
C. at
D. about

Random Topics:
Conditional Sentence Type 2Run-On SentencesBe going to / WillSentences vs Run-OnsSubordinate ConjunctionsComparative and Superlative AdjectivePresent and Past Simple TenseAdjectives & QuantifiersSimple Past ContinuosQuestion TagsOther quiz:
Grammar › ViewWe’d better ___ home now.
A. go
B. to go
Grammar › View
Identifying Phrases and Clauses: I know what I need to do.
A. Gerund Phrase
B. Prepositional Phrase
C. Independent Clause
D. Dependent Clause