Sorry to say I’m busy now and can’t help ______ the lab.
| A．to tidy | B．tidying |
| C．being tidy | D．but tidy |
Though young, he succeeded in taking the machine skillfully and then put it together without any 
difficulty.
| A．out | B．down | C．apart | D．up |
There is no doubt the boxes were then put on a train for Konigsberg, was at that time a German city on the Baltic Sea.
| A．whether, which | B．that, where | C．that, that | D．that, which |
She__________ Robert for ten years.
| A．married | B．married with | C．has been marrying | D．has been married to |
—What do you think of the book?
—Oh, excellent．It’s worth a second time．
A．to read |
B．to be read | C．reading | D．being read |
It’s their duty for the soldiers our country our enemies.
| A．to prevent; from | B．to keep; from | C．to protect; from | D．to stop; from |