1．He was a good swimmer, so he _______ swim to the bank when the boat turned over．

A．must   B．was able to C．could  D．might

2．－Tom, you are caught late again．

－Oh, _________．

A．not at all B．just my luck

C．never mind D．that’s all right

3．You must stand it, and see it through, _________ it costs．

A．no matter what B．no matter how 

C．what  D．which