The students were supposed to （ ）their assignment by now.
A.finish B.have finished C.finishing D.having finished
Marry （ ）my letter; otherwise she would have replied before now.
A.has received B.ought to have received C.couldn't have received D.shouldn’t have received
（ ）their economic system is reformed, the destiny of that country will be hard to predict.
A.Only after B.Unless C.Now that D.As long as
Although the body is made up of many different tissues, these tissues are arranged in an（ ）and orderly fashion.
A.incredible B.intricate C.internal D.initial
I （ ）the packages up before taking them to the post office.
A.bumped B.bundled C.bulked D.bunched
Daylight saving time was instituted to increase productivity.
A.reorganized B.started C.encouraged D.taught