All of __ sudden , I saw __ UFO with _____ alien in it flying in front of my house.
A. the ; the ; a B a ; the ; a C. a ; an ; an D. a ; a ; an
—How long on earth shall I have to wait?
—Sorry, sir. Just a minute. There ________ a table available.
| A．is | B．was |
| C．will be | D．has been |
When I ________ home, I caught a thief stealing from a passerby.
| A．headed | B．was heading |
| C．has headed | D．had headed |
Up to now, thousands of red phone boxes, the old image of Britain, ________ due to mobile phones.
| A．removed | B．have removed |
| C．were removed | D．have been removed |
This is a promising company as its employees ________ to think outside the box and develop creative solutions.
| A．encourage | B．have encouraged |
| C．were encouraged | D．are encouraged |
I can't understand why he ________ so selfish. He isn't usually like that.
| A．was | B．had been |
| C．is | D．is being |