Not until he left his home _____ to know how important the family was for him.
| A．did he begin | B．had he begun |
| C．that he began | D．he had begun |
In hot summer, milk quickly turns sour it is refrigerated.
| A．while | B．if | C．until | D．unless |
He found himselfby a crowd of excited people and to escape.
| A．surrounded; trying | B．surrounding; trying |
| C．surrounding; tried | D．surrounded; tried |
---John, why are you so upset?
---Imy cell phone all morning but it is nowhere to be found.
| A．am looking for | B．have looked for |
| C．have been looking for | D．had looked for |
- A lovely day, isn’t it?
-- Yes. I love when the weather is like this. Why not have our lunch outside?
| A．this | B．it | C．one | D．That |
If people eat natural plant poisons by mistake, they _______ go to hospital without delay.
| A．would | B．can | C．may | D．must |