After so many hardships, the scientist his motherland at last.
| A．set on his foot | B．set foot on | C．set feet on | D．set his feet on |
Compared with the nature forces, our power was so weak that all our efforts to save our homes from the earthquake were __________.
| A．in vain |
| B．in condition |
| C．in effect |
| D．in case |
They rented the old house on the __________ that the landlord would paint it.
| A．assumption |
| B．impression |
| C．succession |
| D．suggestion |
The notice came around two in the afternoon __________ the meeting would be postponed.
| A．when |
| B．that |
| C．whether |
| D．How |
Evidence has been found through years of study __________ children's early sleeping problems are likely to continue when they grow up.
| A．why |
| B．how |
| C．whether |
| D．that |
(2009·重庆) We should consider the students' request __________ the school library provide more books on popular science.
| A．that |
| B．when |
| C．which |
| D．where |