―Helen________ go on the trip with us, but she isn’t quite sure yet.
| A．shall | B．may | C．must | D．can |
The wet weather will continue tomorrow, when a cold front ______ to arrive.
| A．is expected | B．is expecting | C．expects | D．will be expected |
His sister left home in 1998, and _______since.
| A．had not been heard of | B．has not been heard of |
| C．had not heard of | D．has not heard of |
When I talked with my grandma on the phone, she sounded weak, but by the time we ___ up, her voice had been full of life.
| A．were hanging |
| B．had hung |
| C．hung |
| D．would hang |
The way the guests ___ in the hotel influenced their evaluation of the service.
| A．treated |
| B．were treated |
| C．would treat |
| D．would be treated |
Scientists have many theories about how the universe ___ into being.
| A．came | B．was coming |
| C．had come | D．would come |