The letters for the boss ______ on his desk but he didn’t read them until three days later.
| A．was put | B．put | C．has put | D．were put |
From his ______ look, we could see that he hadn’t expected that we could raise such ______ questions to him.
| A．confused; confusing | B．confusing; confused |
| C．confusing; confusing | D．confused; confused |
The laboratory was well ______ for atomic research.
| A．offered | B．equipped | C．provided | D．supplied |
You must ______ a wide vocabulary if you want to learn a language well.
| A．set up | B．put on | C．settle down | D．build up |
Don’t bother Tom, he is ______ with the experiment on water molecules in the lab.
| A．focused | B．fixed | C．occupied | D．concentrated |
Nowadays some parents regret not ______ more time with their kids when they were young.
| A．to spend | B．spending | C．spend | D．being spent |