Japan’s growing sales of technology ________ a major development in this area, and we can also see its progress in other aspects.

In the time of HINI, scientists ____ their spare time to conduct research on the ways of curing the disease.

—what do you think of the matter? —Don’t you remember I have already ________ that it was troublesome?

Mr. Black is an experienced engineer , and he will be employed to        us in improving our equipment .

It wasn’t ________ they found that there was much trouble ________ the plan.