It’s known to us all that the deeper you dive, ________ you can breathe.
| A．the difficult | B．more difficult |
| C．most difficult | D．the more difficult |
.
The second half of his voyage was__________dangerous part, during which he sailed round the Cape Horn.
| A．more | B．most | C．the most | D．the more |
.
--- Are you going to stay overnight?
--- Not__________it’s really necessary.
| A．if | B．unless | C．until | D．since |
.
A volunteer is a person willing to help others, one who offers to do something without__________.
| A．paying | B．paid | C．being paid | D．to pay |
.
The program “Hear with Yushu, Love Has No borders” told touching stories about rescue volunteers, whose brave deeds__________never be forgotten.
| A．can | B．may | C．need | D．must |
.
We didn’t tell Susan about our plan__________upsetting her.
| A．for fear of | B．regardless of | C．in face of | D．instead of |