Fill in the blank space with suitable pronoun

....... must always do one's best:

Choose the word which best fits into the blank.

We went to the airport to see him ........ .

Fill in the space with the suitable connector chosen from those given below.

He doesn't need any money from us ............ we should be going to him for a loan.

................. you help me?

He was not only fined ............... sent out of the class.

.................. you work hard, you will not pass.