When I ________ home, I caught a thief stealing from a passerby.
| A．headed | B．was heading |
| C．has headed | D．had headed |
______ 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 |
I got to the office earlier that day, ______ the 7:30 train from Paddington.
| A．caught | B．to have caught | C．to catch | D．having caught |
I want to open the door, but it _____ open.
| A．couldn’t | B．won’t | C．wouldn’t | D．mustn’t |