Involving or requiring great thought or study.

sixty seconds. Units of time equal to 60 seconds.

To let or permit someone do something.

To become aware of or understand mentally.

action of staying where one is or delaying action until particular time or event. To spend time until an expected thing happens.

continuing or valid to final destination. From the beginning of something until the end. By a particular way or process; by the use of.

person who teaches. People who teaches others, especially in a school.

Expression of good will, as when meeting someone. To meet with friendly words and actions; welcome.

container for storing liquids. Containers with a narrow neck used to hold liquids. place liquid in bottles.

as truth or facts.

act or sound of expelling air from nose in such way. Acts of air suddenly being forced out of nose/mouth. make sudden involuntary expulsion of air from nose and mouth due to irritation of one's nostrils.

used especially at the beginning of a sentence to introduce the last point or idea.

totally.

achieved or maintained by careful and deliberate effort. To focus on learning something usually at school.

person one has affectionate bond with. People who you like and enjoy being with. add someone to list of friends or contacts on social networking website.