The rivers will become dirtier and dirtier ______ we take action to protect them.
| A．since | B．if | C．until | D．unless |
Is your brother good at _____ stories?
| A．tell | B．tells | C．to tell | D．telling |
She is good at dancing . She is a____.
| A．singer | B．dancer |
| C．cleaner | D．Doctor |
Do you like ___ pictures?
| A．draw | B．draws |
| C．drawing | D．Do |
Does he often ___ football after school?
| A．play | B．plays | C．playing | D．Played |
_____ spell it?
| A．Are you |
| B．You can |
| C．Can you |
| D．You do |