— How time flies!
— Yeah. It seems like yesterday that I graduated from college. I can’t believe I for 10 years!
| A．had worked | B．am working |
| C．worked | D．have been working |
Last night, there were millions of people _______ the opening ceremony live on TV.
| A．watch | B．to watch |
| C．watched | D．watching |
__ carefully if any change occurs when doing experiments in the lab..
| A．Observe | B．To observe |
| C．Observed | D．Observing |
Jane is in a hurry because the train to the airport leaves _______ half an hour.
| A．by | B．in |
| C．for | D．until |
---Hi, let’s go skating.
--- Sorry, I’m busy right now. I _______ in an application form for a new job.
| A．fill | B．have filled |
| C．am filling | D．will fill |
Some animals carry seeds from one place to another,plants can spread to new places.
| A． | so | B． | or |
| C． | for | D． | but |