It’s said that non-smokers who are always around smokers have almost the same ______ of suffering from lung cancer.
| A．potential | B．occasion | C．hope | D．opportunity |
The animal makes a strange sound, slightly ______ the bark of a dog.
| A．resembling | B．requesting | C．resisting | D．reflecting |
You got back so late and you didn’t even give me a proper reason _______ you hadn’t called me! I’m very unhappy with you.
| A．when | B．why | C．how | D．which |
There was a big dog ______ in front of Mr. Hill’s house, so David didn’t dare to go near it.
| A．to sit | B．sat | C．sitting | D．sits |
The tourists can not help wondering ______ the ancient people could manage to complete the magnificent building without modern equipment.
| A．that | B．how | C．where | D．what |
We have no choice. _______ we go or we stay, the result is the same.
| A．Once | B．Unless | C．Whether | D．While |