No chicken or duck ______ in the supermarket since the first case of H7N9 was reported dead.
| A．has been sold | B．was sold | C．is sold | D．are sold |
During the period of recent terrorist activities, people _____ not to touch and unattended bag.
| A．had always been warned | B．were always being warned |
| C．are always warning | D．always warned |
It is immediately clear ____ the financial crisis will soon be over.
| A．since | B．what | C．when | D．whether |
Hearing the dog barking fiercely, away.
| A． | fleeing the thief | B． | was fleeing the thief |
| C． | the thief was fleeing | D． | fled the thief |
David threatened_____ his neighbour to the police if the damages were not paid. 
| A．to be reported | B．reporting |
| C．to report | D．having reported |
As a new diplomat, he often thinks ofhe can react more appropriately on such occasions.
| A． | what | B． | which | C． | that | D． | how |