In order not to be disturbed, I spend three days _______ in my study.
| A．locking | B．locked | C．to lock | D．lock |
_____ crying sadly, he raised his head and let tears stream down his face on purpose.
| A．To be seen | B．Seeing | C．To see | D．Having seen |
. ---Who will address the students from our school this e
vening?
--- ______ to be the speaker.
| A．I am supposed | B．I will suppose |
| C．I have supposed | D．I was supposing |
Tommy had had a three-mile drive north _____ he could turn and head back south.
| A．while | B．as | C．before | D．after |
The scientists all agreed that rules of physics, ______ we are all familiar, govern the world.
| A．to which | B．on which | C．which | D．with which |
The news _____the president was killed soon spread over the country.
| A．that | B．what. | C．how | D．/ |