The boy ought to have gone to school ___, but he slept ___noon.
| A．in the morning, at | B．that morning, at |
| C．in that morning, until | D．that morning, until |
You’ll find taxis waiting at the bus station ______ you can hire to reach your host family.
| A．which |
| B．where |
| C．when |
| D．as |
By 16:30, ______ was almost closing time, nearly all paitings has been sold.
| A．which |
| B．when |
| C．what |
| D．that |
After the flooding, people were suffering in that area, _______ urgently needed clean water, medicine and shelter to survive.
| A．which |
| B．who |
| C．where |
| D．what |
The air quality in this city,_______ is shown in the report, has improved over the past two months.
| A．that |
| B．it |
| C．as |
| D．what |
______ I explained on the phone, your request will be considered at the next meeting.
| A．When |
| B．After |
| C．As |
| D．Since |