If it ________ for the heavy rain then, we would have arrived here ahead of time.
—How do you deal with the disagreement between the company and the customers? —The key _______ the problem is to meet the demand _______ by the customers.
In order to make our city green, _______.
In order not to be disturbed ,I spent three days in my study.
He sat back on the chair, took a book and began to read, ___.
David apologized for ______ to inform me of the change in the plan.