| A．cleaned | B．clean | C．am cleaning |
| A．Smoke | B．Don’t smoke | C．Smoking | D．To smoke |
| A．hurt | B．hurting | C．hurts | D．to hurt |
| A．boat | B．road | C．loud |
| A．down | B．row | C．how |
| A．coat | B．crow | C．found |
| A．town | B．snow | C．grow |
| A．tomorrow | B．sometimes | C．yesterday morning |
| A．Was; before | B．Is; before | C．Was; after | D．Is; after |
| A．isn't | B．aren't | C．wasn't | D．weren't |
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