New research has found that animals have memories, too — , they might be much cleverer than we thought.
| A．in other words | B．above all | C．in many ways | D．all in all |
By using ears one can tell the direction _____ a sound comes.
| A．in which | B．from which |
| C．with which | D．through which |
Don’t forget to take your cellphone with you _____ you can call for help if necessary.
| A．now that | B．even if | C．so as | D．in case |
What especially impressed us was the way _____ our teacher studied foreign language.
| A．/ | B．which | C．by which | D．what |
As you know, this is the day_____ the quake happened thirty years ago.
| A．that | B．for which | C．where | D．when |
---Hi , Bruce. Here is a letter for you.
--- Thanks. I wonder _____.
| A．who the letter was from | B．who was from the letter |
| C．who was the letter from | D．who from the letter was |