1. The settlers were unprepared for the long and patient toil ____ the soil would be made to yield crops.

　　[A] by which alone [B] so that [C] because [D] though

　　2. Most electronic devices of this kind, ____manufactured for such purposes, are tightly packed.

　　[A] that are [B] as are [C] which is [D] it is

　　3. The commentator must know the value of silence and how to use it at those moments ____ the pictures speak for themselves.

　　[A] if [B] when [C] which [D] as

　　4. Children are likely to have less supervision at home ____ was common in the traditional family structure.

　　[A] than [B] that [C] which [D] as

　　5. The Social Security Retirement Program is made up of two trust funds, ____ could go penniless by next year.

　　[A] the larger one [B] the larger of which

　　[C] the largest one [D] the largest of which

　　6. Living in the central Australian desert has its problems, ____ obtaining water is not the least.

　　[A] of which [B] for what [C] as [D] whose

　　7. There ought to be less anxiety over the perceived risk of getting cancer than ____ in the public mind today.

　　[A] exists [B] exist [C] existing [D] existed

　　8. The professor can hardly find sufficient grounds ____ his argument in favor of the new theory.

　　[A] which to base on [B] on which to base

　　[C] to base on which [D] which to be based on

　　9. ____ is generally accepted, economical growth is determined by the smooth development of production.

　　[A] What [B] That [C] It [D] As

　　10. No one would have time to read or listen to an account of everything ____ going on in the world.

　　[A] it is [B] as is [C] there is [D] what is

　　11. I’ve kept up a friendship with a girl whom I was at school ____ twenty years ago.

　　[A] about [B] since [C] till [D] with

　　12. He studied hard at school when he was young, ____ contributes to his success in later life.

　　[A] which [B] therefore [C] who [D] so that

　　13. The minister was the person ____.

　　[A] in whose honor the state dinner was given [B] whom the state dinner was given in honor

　　[C] for him the state dinner was given honor [D] whose honor the state dinner was given

　　14. This is an exciting area of study, and one ____ which new applications are being discovered almost daily.

　　[A] from [B] by [C] in [D] through

　　15. ____ can be seen from the comparison of these figures, the principle involves the active participation of the patient in the modification of his condition.

　　[A] As [B] What [C] That [D] It

　　16. He had more dictionaries than ____ for his work.

　　[A] they are needed [B] were necessary

　　[C] it was needed [D] necessary were they

　　17. These proposals sought to place greater restrictions on the use and copying of digital information than ____ in traditional media.

　　[A] exist [B] exists [C] existing [D] to exist

　　18. When the work is well done, a climate of accident-free operations is established ____ time lost due to injuries is kept at a minimum.

　　[A] where [B] how [C] what [D] unless

　　19. ____ Edward Blotkowsk, director of community service at Bentley College in Massachusetts, puts it, “There has to be coordination of programs. What’s need is a package deal.”

　　[A] So [B] Since [C] As [D] Thus

　　20. The Great Wall is the place ____ almost all tourists would like to visit when they come to Beijing.

　　[A] where [B] which [C] of which [D] in which