He tried his best to solve the problem，_____difficult it was.
A however B. no matter C. whatever D. although
The manager believes prices will not rise by more than _______ four percent.
| A．any other | B．the other |
| C．another | D．other |
My parents _______ have arrived at suppertime but their flight was held up due to the heavy fog.
| A．will | B．can | C．must | D．should |
The reason _______ he didn’t come was _______he was injured.
| A．that, because | B．why, that |
| C．why, because | D．that, that |
_______life in a new country can be difficult, it can broaden a person’s view of the world.
| A．While | B．Since | C．Because | D．As |
Mary decided to attend the party, _______ to see her friends whom she hadn’t seen for ages.
| A．hoped | B．hoping | C．to hope | D．hopes |