Please help me it this

Dear Student,
The solution to your query is as given below:

a) When they reach the station, they will call you.
b) If it starts raining, we will stop at the nearest shop.
c) Before I complete my homework, I need to ask my friend a few questions.
d) Please repeat what you said, because I could not hear you.
e) Although the speaker wasn't fully prepared, the presentation went well.
f) Radhika is a lovely person, and she talks very gently.
g) The case will get solved if we get the witness report quickly.
h) She sang beautifully, although she was nervous.

Regards!