The math problem was _________ difficult __________ none of us worked it out.
| A．very; that | B．too; to | C．so; that | D．enough; that |
–-You’d better go to see the dentist and have the bad tooth pulled out.
--- ____-
That’s all right B. that’s right
C. Yes, pleaseD. Yes, I will
In ancient China, horses are often ___ good luck .
| A．connected to | B．consisted of |
| C．competed with | D．communicated with |
____ are you driving? I think it’s more than 100 kilometers an hour now.
| A．How long | B．How far |
| C．How fast | D．How soon |
To be a good teacher, you ___ be able to hold the attention and interest of your students.
| A．must | B．may |
| C．can’t | D．needn’t |
Bobby didn’t have dinner ___he finished designing the plans.
| A．while | B．if |
| C．until | D．since |