We finished the job last night, but it was already midnight ____________ I arrived home．
| A．while | B．when | C．where | D．that |
__ 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 |
— I get at least half an hour of exercise almost every day.
— Oh great!.
| A．Good luck | B．Cheer up |
| C．Same to you | D．Keep it up |