单项选择题
The chief engineer suggests that the second engineer （） a dead line for handing in the work plan.
A.will set B.shall set C.set D.sets
单项选择题 After he （） the test, the engineer put down the results.
单项选择题 Now that the valve is not worth （）, I suggest it （）.
单项选择题 （） to damage the protective coating on the inner side of the shell.
