$($c$)$ Give a regular expression for the following languages. The alphabet is $\{0,1\}.$

$$ L$1=\{$w$|$ w begins with $1$ ends with $0\}$

$$ L$2=\{$w$|$ w the length of w is at most $5\}$

$$ L$3=\{$w$|$ w starts with a $1$ and has odd length, or starts with a $0$ and has even length $\}$

$$ L$4=\{$w$|$ is any string except $0$ and $11\}$