Phong, Vy and Duy (ride)…. their bicycles to school now
A. aren’t riding
B. don’t riding
C. haven’t riding
D. hasn’t riding

Random Topics:
Comparative and SuperlativesVerb FormsLet & Be allowed toSuffixes and TensesCan vs CouldSpeech TensesPast Tense vs Present Perfect TenseReported Speech and Reported QuestionsModals TensesSubordinating Conjunctions and ClausesOther quiz:
Relative Pronouns and Adverbs › ViewWhich sentence is correct?
A. I made the cupcakes whom have the gummy worms on top.
B. I made the cupcakes who have the gummy worms on top.
C. I made the cupcakes that have the gummy worms on top.
D. I have the cupcakes which have the gummy worms on top.
Relative Clause › View
This cat _____ sister ate fish yesterday.
A. This cat whose sister ate fish yesterday.
B. This cat which sister ate fish yesterday.
C. This cat who sister ate fish yesterday.
D. This cat whom sister ate fish yesterday.
Infinitives › ViewWhat is the infinitive phrase in the following sentence?
In the mall, we want to walk quickly to the food court.
_
A. to walk
B. to the food court
C. In the mall
D. to walk quickly to the food court
Vocabulary and Grammar › View
A great way to improve ______ skills is to keep trying new things.
A. reason
B. reasoning
C. reasons
D. reasoned