—Is there anything wrong, Bob? You look sad.
—Oh, nothing much. In fact, I __________ of my friends back home.
| A．have just thought | B．was just thinking |
| C．would just think | D．will just be thinking |
We are not ready to go into production yet, for the new switch mechanism isn’t fully ______.
| A．tried out | B．tested out |
| C．worked out | D．turned out |
Helen always helps her even though going to school ________ most of her day.
| A．turns up | B．makes up | C．saves up | D．takes up |
The policeman came up to the house, whose door was open, ________ there for a while, and went in.
| A．to stand | B．standing | C．stood | D．stand |
—Too noisy outside! I just can’t focus on my study.
—______. Let’s go outside and play soccer instead.
| A．I don’t think so |
| B．Same here |
| C．Please be more patient |
| D．Don’t push me too hard |
To my delight, the students are recycling many things they ______ away in the past.
| A．were throwing | B．will be throwing |
| C．had thrown | D．would have thrown |