Unit l

　　1. ___________ that she realized it was too late to go home.

　　2. Color and sex are not relevant to _______________________ .

　　3. Corn originated in the New World and thus ________________ until Columbus found it being cultivated in Cuba.

　　4. I dont mind your delaying making the decision _________________.

　　5. There are few electronic applications _________________________ .

　　Unit l

　　1. It was not until dark that

　　2. whether a person is suitable for the job

　　3. was not known in Europe

　　4. as long as it is not too late

　　5. more likely to raise fears concerning future job opportunities

　　respecting, regarding , concerning: I wrote a letter respecting / regarding / concerning my daughters school examinations.

　　provided = if : We will pay you the bonus provided the job is completed on time.

　　supposing. Supposing it rains tomorrow, what will you do?