Answer: vast
Explanation: vast means long and never ending, and I feel that fits better than tedious which means boring and lingering. :)
The word to be used that best completes the statement would be "had been having." The word is considered at a past perfect continuous state. This state of the verb should be used when indicating an action that was continuously done in the past. Simply and the progressive tense of the verb by "had been."
The major problem in texting is the abbreviations, such as "u", " gtg","ttyl","lmao" and so on. These abbreviations cause improper grammar. Those who use these abbreviations, instead of using proper grammar, get into the habit of using "u" and "gtg" and then when they write a paper, or reply to an email, or something they end up using those same abbreviations. Causing a deterioration in proper English usage.
<span>Effective decision making means comparing the additional costs of the alternatives with the benefits. For example, you could perform a cost-benefit analysis. This is a common technique to aid decision making.</span>
