Although schistosomiasis is not often fatal, there is so much debilitation that it has become an economical drain on many developing countries.
it is so debilitating that it has become an economic
it is of such debilitation, it has become an economical
so debilitating is it as to become an economic
such is its debilitation, it becomes an economical
These cherry trees have bloomed every spring ___ 1980.
For
After
Since
None of these
I haven't seen him ___ a long time ago.
He hasn't been in jail ___ that time.
I haven't talked to him ___ last week.
The students went home ___ school.
She's been sick ___ yesterday.
He hasn't been in jail ___ more than three years.
I haven't seen him ___ a long time.
They've been in love ___ three weeks.