Underline the correct preposition in the sentence.

1.) We solved the problem (by means of, by) a new device developed by our engineers.
2.) I am standing here (under, on behalf of) my colleagues.
3.) (In general, Generally) we are impressed with her performance.
4. ( Because of, In case of) fire, break glass to escape.
5.) Can you help me (in any way, at any way)?​