In some cases, different approaches __________ the same scientific problem lead to the conflicting theory.
| A．to | B．of |
| C．in | D．for |
By 16:30,was almost closing time, nearly all the paintings had been sold.
| A． | which | B． | when | C． | what | D． | that |
--Have you paid? What's my share of the bill?
--. It wasn't very much.
| A． | Don't worry about it. | B． | It's my share |
| C． | None of your business. | D． | It's up to you. |
--Look! Somebody the sofa.
--Well, it wasn’t me. I didn’t do it.
| A．is cleaning | B．was cleaning | C．has cleaned | D．had cleaned |
It suddenly occurred to himhe had left his keys in the office.
| A． | whether | B． | where | C． | which | D． | that |
I'vethe habit of calling in on my grandparents on my way home from school.
| A． | come into | B． | gone into | C． | got into | D． | run into |