________ day you come, we will be pleased to see you．
| A．Whenever | B．Wherever | C．Whoever | D．Whichever |
A huge amount of oil was spilt on the East Sea, the causes of ______ are still under investigation.
| A．it | B．that | C．which | D．whom |
--- Has James finished his report on his Enquiry Learning yet?\
---- I’m not sure. He _____ on it last week.
| A．was working | B．has worked | C．worked | D．had worked |
If you are traveling_ the customs are really foreign to your own，please do as the Romans do.
you may have, you should gather your courage to face the challenge.
| A．However a serious problem | B．What a serious problem |
| C．However serious a problem | D．What serious a problem |
You can’t predict everything. Often things don’t ________ as you expect.
| A．work out | B．break out | C．run out | D．put out |