---What do you think of the film?
---Cool! Never before _____ a better one.
| A．had I seen | B．I have seen | C．have I seen | D．I had seen |
一个四棱锥和一个三棱锥恰好可以拼接成一个三棱柱.这个四棱锥的底面为正方形，且底面边长与各侧棱长相等，这个三棱锥的底面边长与各侧棱长也都相等．设四棱锥、三棱锥、三棱柱的高分别为
，
，
，则
（ ）
A． |
B． |
C． |
D． |
Students are encouraged to _________ the design competition for robots at the university.
| A．take part | B．operate | C．join to | D．participate in |
Most parents are not __________ the danger of their babies’ eating jelly, which causes most unfortunate incidents to happen.
| A．well aware to | B．very aware of | C．aware that | D．well aware of |
—Would you like to help us?
— , no.
| A．In a word | B．In words | C．In word | D．In other words |
You can’t see things clearly through a telescope unless it is correctly ________to your sight.
| A．Adjusted | B． Examined | C． Checked | D． tested |