The car passed through the streets _____ we thought was a very dangerous speed.
| A．which | B．at which | C．at what | D．what |
_________on the main street, the market was busy yesterday.
| A．Located | B．locating | C．being located | D．to be located |
They were surprised that a child should work out the problem _____ they themselves couldn’t.
| A．when | B．where | C．until | D．while |
--- You must obey every word of mine.
--- _____ I don’t?
| A．What if | B．So what | C．How if | D．Only if |
_____ the lecturer more clearly, I arrived early and chose a front seat.
| A．Hear | B．To hear | C．Heard | D．Hearing |
---You have made great progress in your English study, haven’t you?
--- Yes, but much _____ .
| A．remains to do |
| B．is remained to do |
| C．remains to be done |
| D．is remained to be done |