Part One (60 Points)
Complete each of the following sentences with the most likely answer (25points.)
1.When summing up our experience in socialist construction,_______ on the lessons drawn from our failures and mistakes.
A. stress should be laid
B. we should lay stress
C. stress should lay
D. we should be laying stress
2.Mary had just arrived, but she talked as if she_______ about our plan.
A. had known
D. has known
3._______is often the case in nature, the commonest things are the most complicated.
4.Neither the teacher nor Bob’s parents_______ satisfied with his school work.