The girl looked at me with a ____expression. Maybe the problem was quite ______.
| A．puzzled; puzzling | B．puzzling; puzzled |
| C．puzzled; puzzled | D．puzzling; puzzling |
Now a lot of new technologies can ___________ problems in industry.
| A．be applied to solve | B．be applied to solving |
| C．apply to solve | D．apply to solving |
________ entered the classroom _________ the bell rang.
| A．We hardly had, before | B．Hardly had we, when |
| C．Hardly had we, than | D．Hardly did we, when |
So loudly ______ that every one of the class could hear him.
| A．did he speak | B．did he spoke |
| C．spoke he | D．he spoke |
---What do you think made her so upset?
---_____________ her hometown.
| A．As she missed | B．Missed | C．Because of missing | D．Missing |
Though ___________ to see us, the professor gave us a warm welcome.
| A．surprising | B．was surprised | C．surprised | D．being surprised |