Fill in the gaps with correct word given in the brackets.
a) Which is .......
longest rives in the world (a/an/the)
b) He was born .....
1975(by/in/on)
c) Let's play ...... (will you/shall we/do we)
d) I spent the night studying ...
I wanted to get good grades.(because/to/so that)
e) She did it ....................(herself/himself/yourself)​