—I called you at 4:50 yesterday afternoon, but no one answered.
—Sorry. I_______with my friends at that time.
| A．swam | B．swim | C．was swimming | D．will swim |
What are they doing? They ____________.
| A．take photos | B．are taking photo | C．take a photo | D．are taking photos |
Some girls are on the hill. Where are ____________?
| A．another girl | B．others girls | C．the other girls | D．the other girl |
We are doing ____________.
| A．our homeworks | B．us homework | C．we homework | D．our homework |
The birds are singing ____________ the tree.
| A．on | B．in | C．of | D．at |
___________________ are Young Pioneers.
| A．All student | B．All of students | C．All of the students | D．All students |