I'm afraid this painting is not by Picasso. It's only a copy and so it's _____.
| A．priceless | B．invaluable | C．unworthy | D．worthless |
— Do you mind if I keep pets in this building? — _______ .
| A．I'd rather you didn't, actually. |
| B．Of course not, it's not allowed here. |
| C．Never mind |
| D．No, you can't. |
Dr Yuan Longping grows ________ is called super hybrid rice, _________ has a high output.
| A．what; which | B．that; what | C．that; which | D．what; what |
People try to avoid public transportation delays by using their own cars, and this ______ creates further problems.
| A．in return | B．in case | C．in addition | D．in turn |
______ I’m tired of life here, I have been considering trying my luck in another city, but I haven’t decided yet.
| A．As for | B．Now that | C．As if | D．Thanks to |
---- What’s that noise?
---- Oh, I forgot to tell you. The new machine ______.
| A．was tested | B．will be tested | C．is being tested | D．has been tested |