Our maths teacher set so difficult an examination problem ______ none of us worked out.
| A．which | B．that | C．as | D．so that |
My father warned me going to the West Coast because it was crowded with tourists.
| A．by | B．on | C．for | D．against |
Based on a true story, the film shows a hero racing ______ time to get back the stolen papers.
| A．behind | B．against |
| C．about | D．at |
Many people have donated that type of blood; however, the blood bank needs _____.
| A．some | B．less | C．much | D．more |
The landlady prefers to have women in the apartment rather than men. She thinks women take______ care of things!
| A．well | B．good | C．better | D．best |
A person who has never tasted bitter won’t know ______ sweet is.
| A．which | B．what | C．when | D．why |