
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
In the Cartesian coordinate system $xOy$, with the origin $O$ as the pole and the positive half-axis of $x$ as the polar axis, a polar coordinate system is established. It is known that curve $C_{1}$: $\begin{cases} \overset{x=-4+\cos t}{y=3+\sin t}\end{cases}$ ($t$ is the parameter), $C_{2}$: $\begin{cases} \overset{x=8\cos \theta }{y=3\sin \theta }\end{cases}$ ($\theta$ is the parameter).

(Ⅰ) Convert the equations of $C_{1}$ and $C_{2}$ into standard form and explain what curves they represent respectively;

(Ⅱ) If the point $P$ on $C_{1}$ corresponds to the parameter $t= \frac {\pi}{2}$, and $Q$ is a moving point on $C_{2}$, find the minimum distance from the midpoint $M$ of $PQ$ to the line $C_{3}$: $\rho(\cos \theta-2\sin \theta)=7$.

Present the answer in LaTex format: \boxed{Your answer}
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