Science and technology have in important ways __________ the improvement of agricultural production.
| A．contributed to | B．resulted from | C．carried off | D．handed over |
_____a pleasant,small conversation with someone you don’t know,and people will feel relaxed and enjoy your company.
| A．Starting | B．To start |
| C．Start | D．Having started |
____makes some people appear astonishingly youthful while others seem much older than their actual age?
| A．What it is | B．What is it that |
| C．What it is that | D．Why it is what |
Don’t miss the musical when it____next month because all the actors give world class performances.
| A．comes | B．will come |
| C．is to come | D．is coming |
Recent studies have discovered that fathers uniquely contribute to the development of
their children, _____in low income families.
| A．specially | B．definitely |
| C．specifically | D．particularly |
Everyone has such a busy life that sometimes it becomes tough to _____ with it.
| A．break up | B．end up | C．keep up | D．make up |