Google is testing a new television programming search service, _____ users to find shows videos from websites like Youtube.
| A．having allowed | B．allowing | C．to allow | D．allowed |
With more and more forests disappearing, today the public is much concerned about the way _________.
| A．nature is being ruined | B．which nature is ruined |
| C．on which to ruin nature | D．of nature to be ruined |
Without the friction (摩擦力) between feet and the ground, people would ______ be able to walk.
| A．in no time | B．by all means | C．on any account | D．in no way |
Don’t take his remarks too seriously. He was so sad that I don’t think he really _________ what he was saying.
| A．knew | B．knows | C．was knowing | D．had known |
--- Could you take a message for Mr Brown?
--- Certainly. I ________ him about something else in any case. So it _______ any bother.
| A．may see; isn’t | B．see; won’t be | C．will see; isn’t | D．will be seeing; won’t be |
His aunt’s letters ________ memories of those beautiful days when they used to live together in his hometown.
| A．call at | B．call for | C．call on | D．call up |