The computer was invented in the 1940’s and ______ quite a lot ever since.
| A．was changed | B．had changed |
| C．has been changed | D．will change |
I have been waiting for a bus for so long. If only I _______ a book with me!
| A．brought | B．would bring |
| C．had brought | D．bring |
The computer system_________ suddenly while he was watching news on the Internet.
| A．broke out | B．broke in |
| C．broke up | D．broke down |
--Look! What are the Greens busy doing?
-- Mrs Green is cutting the grass; _________, her husband is planting the roses.
| A．rather | B．instead |
| C．thus | D．meanwhile |
____ I saw him, I knew he was the man the police were looking for.
| A．Previously | B．Immediately |
| C．Accurately | D．Especially |
--How do you like the film Frozen?
--Great! Never before _________ a better one.
| A．had I seen | B．I have seen |
| C．have I seen | D．I had seen |