Could you help me with this sentences,please?

I would like you to tell me what the correct answer is in the following sentences :

1) Never before ..... as rapidly as during the last ten years.

a) communications have developed b) have communications developed

c) have communications being developed d) have been developed communications

I would say : B

2) Despite ..... hard,he failed the exam.

a) he studied b) that he studied c) him having to study d) studying

I would choose : D

3) The decision by ..... to plead guilty to tax evasion could well hasten the end of the country's cherished tradition of bank secrecy.

a) the Swiss oldest bank b) one of the oldest Swiss bank

c) the oldest Switzerland's bank d) Switzerland's oldest bank

What about "C" ?

4) I .... to work since I broke my leg

a) didn't go b) don't go c) wouldn't go d) haven't been

I have a doubt : A or D?

5) I'm not at all worried, ..... he'll succeed.

a) I confide b) I'm trusting c) I'm faithful d) I'm confident

I'd say : B

That's all,thank you very much!