the tree .| A．on | B．to | C．in | D．off |
| A．in | B．on | C．at |
| A．a,a | B．an,an | C．an,a |
| A．do | B．doing |
| A．drink | B．drinking |
| A．Swim | B．Swims | C．Swimming |
| A．in front of | B．behind | C．in |
| A．and | B．of | C．or |
| A．have ; legs |
| B．has ; legs |
| C．has ; leg |
| A．Was, watches | B．Did, watching | C．Did, watch | D．Does, watch |
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