——What are you busy doing these days?——We are working hard _________ high marks in the test.
I have been to the park many times. Let’s go to the museum _______.
Have you ever ________ to Qingdao? There is ______ aquarium at the seaside.
Your brother has lunch at home, _______?
---Tom, please take out the trash. ---OK, _______, mom.
My sister has been learning skating for __________.