How much time did you spend ________ a bargain?
— Could you tell me how to get to the National Stadium?— Sorry, I’m not sure . _____ ask the policeman over there?
I think the best way to go to school is by ______underground.
The students _______ the homework every day. Now they _______their homework in the classroom.
Are you ________ plant trees on March 12th?
My father ___ me a nice present on my next birthday.