You promised your friend a letter; you ought to ______ days ago.
| A．write | B．be writing | C．have written | D．be written |
I told Sally how to get there, but perhaps I ________ for her.
| A．had to write it out |
| B．must have written it out |
| C．should have written it out |
| D．need to have written it out |
Many grocery stores use misting, a process ________vegetables are sprayed with water, to keep vegetable fresh.
| A．which | B．that | C．what | D．where |
_________ the unwritten rule goes, study is good, but health comes first.
| A．Which | B．That | C．As | D．What |
— There is a story here in the paper about a 110-year-old man.
— My goodness! I can’t imagine________that old.
| A．to be | B．to have been | C．being | D．having been |
John thinks it won’t be long __________ he is ready for his new job.
| A．when | B．after | C．before | D．since |