Question: 
1. Fill in the blanks with ‘if’ or ‘unless’.

(a) I won’t be able to assist you ____ you give me all the details of the report.
(b) I will take this job ________ the working hours suit me.
(c) ______he advertises on TV, he will get a lot of publicity.
(d) _____ it is very cold, we will not have any snow.
(e) The thief threatened to kill us ____ we didn’t give him the money.
(f) ____ you use high quality material, you cannot build a strong house.


{Please explain where to use "if" and whrere where to use "unless" in the following situations and why}