Just who inspired English painter John Constable's marvelously enigmatic cloud studies, much prized by collectors, have, have never been entirely clear.

The essential $\underset{a}{\underline{basic}}$ ingredient in the $\underset{b}{\underline{creation}}$ of a $\underset{c}{thunderstorm}$ is a warm. moist $\underset{d}{\underline{unstable}}$ atmosphere

Cell division$\underset{a}{\underline{ depends }}$ the replication

of DNA molecules $\underset{b}{\underline{and}}$ the separation

$\underset{c}{\underline{of the}}$ products of this$\underset{d}{\underline{ replication}}$

Slang, $\underset{a}{\underline{which }}$ is not$\underset{b}{ \underline{generally acceptable}}$ in formal usage, is notable for$\underset{c}{\underline{its}}$ liveliness humor and it $\underset{d}{\underline{exaggerates.}}$

Bonds can provide a$\underset{a}{\underline{ steady flow }}$ $\underset{b}{\underline{of income}}$ to help $\underset{c}{\underline{of living expenses,}}$which makes them especially suitable$\underset{d}{\underline{for retired people}}$.

$\underset{a}{\underline{Investment }}$ money means to $\underset{b}{\underline{put it}}$ into some business project such as $\underset{c}{\underline{operating}}$ a mine building a housing complex, or $\underset{d}{\underline{doing}}$ medical research.

As road traffic(a) increases, elevated highways (b) are built to help solve the (c ) problem of traffic jam.(d) a