If you take a nap in the afternoon, it's a little like hitting reset on the timer that controls your ability to return to sleep. A short nap, typically 15 to 20 minutes, will affect you less than a nap that lasts for hours. In addition, a nap in the early afternoon may allow you 10 hours in which to build up the desire for sleep again. However, a nap in the hours preceding bedtime may make it more difficult to get back to sleep later. The underlined word can be replaced by ….

At an early age, Marie displayed a brilliant mind and a blithe personality. Her great exuberance for learning prompted her to continue with her studies after high school. ____, she became disgruntled ...

"Morning sickness" is the term often used to describe mild nausea and vomiting that occur ____ pregnancy.

Nuclear energy has been a subject to controversy for many years.For some, nuclear energy should not be underutilized as it is considered the most environmentally friendly energy source. (1)____ coal a...

Turtles, seals, birds and dolphins often mistake plastic waste for food. Plastic bags floating in the water can look like jellyfish, for example. After animals eat plastic, their intestines get blocke...

There is little chance that we will succeed in changing the law. ____, we should never stop trying.