[ Present Tenses ]
You look very serious. What ___________ about?
A. do you think
B. are you thinking

Random Topics:
Demonstrative PronounVerb PatternsTOEIC Grammar and Vocabulary ReviewVerb Patterns / IngPossessive AdjectivesVerbs of movementEd and Ing EndingsSimple TensesPresent simple, Present continuous, Singular, PluralInfinitive and GerundsOther quiz:
Conjunctions › ViewBen fell down ___ hurt his knees.
A. and
B. or
C. but
Grammar › View
Would you mind if I …………………………your bike?
A. borrow
B. borrowed
C. to borrow