---Imagination     important in science, and it helps us dream up our future.
---You are definitely right. If only something         allow me to see insects and spiders magnified without getting close to them.
A．was; would B．is; willC．will be; canD．is ;could
D
第一空是陳述客觀真理， 所以用一般現(xiàn)在時態(tài)；第二空是虛擬語氣，與現(xiàn)在事實相反，用過去式，選D
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