Using the Auto-complete function
Put the cursor on the needed position in the document.
Press Ctrl+Space to get the Auto-complete form.
Select the token in the list of this form; or type first letters of the token to reduce the token list and then select the appropriate token.
Press Enter or double-click the selected token to complete the word next to the cursor.
Use Alt+Space hotkeys instead of Ctrl+Space in the Mac OS.
Click the outside area of the form to quit the Auto-complete form.
Press Esc to discard the Auto-complete form.