______ for something, a receipt is given to you.
| A．Paying | B．Having paid |
| C．When you have paid | D．To be paying |
The shop-assistant was straight with his customers. If an article was of _____ quality, he'd tell them so.
| A．minor | B．humble | C．inferior | D．awkward |
. What you have done is _____ the doctor's orders.
| A．attached to | B．resistant to |
| C．responsible to | D．contrary to |
. The police refused to _____ the clues they were working on.
| A．exhibit | B．disclose | C．expose | D．discern |
. Driving a car without insurance can have _____ consequences.
| A．uncertain | B．disastrous | C．potential | D．unworthy |
. Probability is the mathematical study of the _____ of an event's occurrence.
| A．desire | B．likelihood | C．result | D．effect |