______ he met with the difficulty did he realize the importance of our help.
| A．Even though | B．Never until | C．Only before | D．Ever since |
Jack is the ______- child in the family; he wants to have a brother.
| A．one | B．single | C．only | D．separate |
Only in this way, directed by the teacher, ______work out the problem the day before.
| A．had they | B．they could | C．could they | D．did they |
He went swimming on a hot day, ________.
| A．only to be drowned | B．so as to be drowned |
| C．in order to be drowned | D．so that he could be drowned |
The wounded policeman ____though doctors made every effort to save him.
| A．died | B．had died | C．killed | D．has been dead |
– Could you tell me where Mr. Smith lives?
--- Well, he is ______here. He passed away three years ago.
| A．no longer | B．no more | C．not more | D．not longer |