Tom said he had been working for three hours, _____ ,evidently, was untrue.
| A．he | B．this | C．it | D．which |
Scientists think they have _____ in their attempt to find the causes of some major dieases.
| A．broken through | B．worked out |
| C．fallen out | D．got round |
If you ever have the _____ to go abroad to work, you should take it.
| A．possibility | B．offer | C．luck | D．chance |
Stressful environments lead to unhealthy behaviors such as poor eating habits, which _____ increase the risk of heart disease.
| A．in turn | B．in return | C．by chance | D．by turns |
Teenagerstheir health because they play computer games too much.
| A．have damaged | B．are damaging | C．damaged | D．will damage |
——I am afraid I can’t return the book to you before Friday.
——.
| A．Don’t be afraid | B．Be careful | C．Not at all | D．Take your time |