Which sentence to start with in a covering letter?

How many addresses do we have to write in a formal letter ?

I .......................... good communication skills.

Everything in life has both .............................................................

Many people think that women teachers are better .............................. men.

.................. the one hand, many people argue that women make better teachers because they are more creative.

........................................., using mobile phones can help students to do their projects.

In addition, some people think that women are worse teachers ........................................ they are less serious than men.

There are many bad ................................. for studying abroad.