There are lots of problems in your hometown, but we're happy to see many of them________.
| A．are solving | B．are solved | C．have solved | D．are being solved |
I’m glad to see that you ________ a lot of progress since I ________ you last.
| A．will make; have met | B．have been making; met |
| C．had made; met | D．have made; meeting |
－Oh, it’s you, Steve! I ________ you.
－No surprising. I’ve just had my hair cut.
| A．don’t recognize | B．haven’t recognized | C．didn’t recognize | D．hadn’t recognized |
I would have come sooner but I ________ that they were waiting.
| A．haven’t known | B．hadn’t known | C．don’t know | D．didn’t know |
—Did you find the missing couple in the mountain yesterday?
—No, but we ________ to get in touch with them ever since.
| A．have tried | B．have been trying | C．had tried | D．had been trying |
—Such a mistake could have been avoided.
—Unfortunately, he ________ the mistake again and again.
| A．repeated | B．would repeat | C．had repeated | D．would have repeated |