He made another wonderful discovery, ______ of great importance to science.

We climbed to the top of Dayan Pagoda at night , believe it or not, ______ we could see a Buddha image in the sky.

In many factories computers have___________ the work of thousands of workers

te many children’ s books, nearly half of____ were published in the 1990s.

Thenew machineis technically far to the previous type.[ ]