Of the seven days in a week. Saturday is said to be the most popular _______ for a wedding in some countries.

It can’t be a（n） _______ that four jewelry stores were robbed in one night．

As is well－known，the brain performs a very important ________，which controls the nerve system of the body.

To make members of a team perform better，the trainer first of all has to know their      and weaknesses．

If you don’t work hard, it will be of no significance for others to help you.