. Don't bother Tom, he is with the experiment on water molecules in the lab.
| A．focused | B．fixed | C．occupied | D．concentrated |
The twins were so much alike; I could hardly ________ Tom.
| A．pick up | B．pick out | C．pick off | D．pick at |
—I’m sorry. I ________ at you the other day.
— Forget it. I was a bit out of control myself.
| A．shouldn’t shout | B．shouldn’t have shouted |
| C．mustn’t shout | D．mustn’t haven’t shouted |
________ he finished writing his paper in such a short time surprised us all.
| A．When | B．Why | C．That | D．What |
The man ________ as “a crazy guy” is actually the boss of our company.
| A．who has referred | B． referred to | C．referring to | D．who referred to |
________ his help, I finally caught up with my classmates.
| A．Rather than | B．In spite of | C．Instead of | D．Thanks to |