The teacher told me _________when I left the classroom.
| A．lock the door | B．to lock the door |
| C．to knock at the door | D．knock at the door |
——Who watered the flowers beside the window?——Helen ____________.
| A．Did | B．Do | C．did | D．does |
Goldfish don’t know _______ to them three seconds ago.
| A．what happens | B．what is happening | C．what happen | D．what happened |
Does this book belong to ______?
| A．me | B．mine | C．I | D．my |
It ______ him an hour to play basket ball every day.
| A．spends | B．took | C．costs | D．takes |
These aren’t ________ cards. They’re_______
| A．ours, their | B．our, theirs | C．our, their | D．ours theirs |