We had to wait half an hour _______ we had already booked a table.
| A．since | B．although | C．until | D．before |
Recycling is one way to protect the environment; reusing is _____.
| A．another | B．the other | C．one another | D．one |
I would have gone to my cousin’s birthday party last night, but I ______ available.
| A．was | B．had not been | C．was not | D．would not be |
______ is often the case in science, there is no simple answer
| A．That | B．As | C．When | D．Where |
The airport ______ next year will help promote tourism in this area.
| A．having been completed | B．completed |
| C．being completed | D．to be completed |
______ you said at the meeting describes a bright future for the company.
| A．When | B．How | C．What | D．That |