. Stressful environments lead to some unhealthy behavior such as a poor eating habit, which _____ increases the risk of heart disease.
| A．in turn | B．in return | C．by chance | D．by turns |
Thank you for the trouble me with the work.
| A．having; helping | B．taking; helping |
| C．taking; to help | D．having; to help |
His name was on the _____ of my tongue, but I just couldn't recall it.
| A．end | B．point | C．edge | D．tip |
Though he did not say so directly, the inspector _____ the man was guilty.
| A．declared | B．implied | C．disclosed | D．said |
Mr Smith, of the speech, started to read a novel.
| A．tired; boring | B．tiring; bored |
| C．tired; bored | D．tiring; boring |
All of us still remember the terrible earthquake that Tangshan twenty years ago.
| A．attacked | B．struck |
| C．knocked | D．exploded |