Dr Yuan makes______ possible______ one-third more of the crop in the same fields.
| A．it; produce | B．it; producing | C．it; to produce | D．it; produced |
______more information ,write to the address below.
| A．To | B．On | C．From | D．For |
If you______the right map , we wouldn’t have got lost.
| A．have bought | B．bought | C．had bought | D．would buy |
—Which umbrella can I take?
—You can take______of them; I will use none.
| A．both | B．any | C．either | D．each |
Living in the desert involves a lot of problems，______water shortage is the worst.
| A．of which | B．when | C．of whose | D．Which |
Only when you have obtained enough data______ come to a sound conclusion.
| A．can you | B．you can | C．would you | D．you would |