A．hole
B．none
C．old
D．fold

A．he often visits me
B．I often telephone him
C．he writes to me now and then
D．I live not far from him

A．Science, New Technology and Agriculture
B．Development of Science and New Technology Has Improved Agriculture
C．Orchard Workers Are Interested in the Development of Science and New Technology
D．Science and New Technology Can Enrich a Country