_________, and you will be healthier.
| A．Keep exercise | B．Keeping exercising |
| C．Keep exercising | D．Keeping exercise |
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 |
Excuse me, we can’t ____________ our tickets.
| A．look for | B．find | C．to look for | D．to find |
What about ____________ computer games.
| A．to play | B．to playing | C．playing | D．play |