Why these things happened was ____ the driver had been careless.
| A．because of | B．owing to | C．due to | D．that |
—Do you have anything to say for yourselves?
—Yes，there's one point ______ we must insist on.
| A．why | B．where | C．how | D．/ |
Having been praised by the teacher，the little girl ran back home，______.
| A．happily and satisfied |
| B．eager and excitedly |
| C．happy and satisfied |
| D．anxiously and excitedly |
Despite their______ of interest，Fleming kept trying to develop the chemical ______ it would be safe and effective.
| A．lacking；in order to | B．lack；so that | C．lack；so as to | D．lacking；so that |
Helen always helps her mother even though going to school ______ most of her day.
| A．takes up | B．makes up | C．saves up | D．puts up |
We regret to inform you that there are no tickets ______ for Friday's performance.
| A．available | B．useful | C．convenient | D．affordable |