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:
Vocabulary and Sentence Structure › ViewThe manager assigned a difficult task to the new employee. He completed it successfully.
A. Completing the difficult task which assigned by the manager was successful for the new employee.
B. After assigned a difficult task by the manager, the new employee successfully completed it.
C. The manager assigned a difficult task to the new employee, but he completed it successfully.
D. The new employee successfully completed the difficult task assigned by the manager.
Grammar › View
__________ do you study?
A. Want
B. Because
C. Where
What 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