Answer:
Flabby expressions refers to the use of extra words in a sentence/ statement that do not add any meaning but can make the statement unclear.
The revised sentences are:
a. We cannot complete the construction now because building costs have jumped considerably.
b. Normally, we would seek additional funding; however, with the increase in rates, we cannot.
c. Borrowing money for a period of 90 days or less has only been advisable in very few cases.
d. Even though sales are gradually increasing, we might still seek a loan of $50,000.
e. We received no response to our bid however, we are still available in the event that you wish to proceed with your building project.