If you have a job，________ yourself to it and finally you'll succeed.(2010·四川)

Don’t ___ shy. Everyone may make mistakes at the beginning.

We haven’t seen each other for many months.＿＿! 

It’s a fine day. Let’s go swimming, ＿＿＿＿＿? 

________ blood if you can and many lives will be saved.