When he looked up，he suddenly found himself________by a group of teenagers，________looked at him anxiously.
| A．to be surrounded；which | B．surrounded；who |
| C．be surrounded；who | D．having been surrounded；which |
___ this book and tell me what you think of it.
| A．Look through | B．Look on | C．Look into | D．Look up |
He decided to visit the family ___ Friday night.
| A．at | B．in | C．on | D．over |
Are you paying now, or shall I ＿＿＿＿＿＿ to you?
| A．book it down | B．book it in | C．book it up | D．book it out |
Please drop ＿＿＿＿＿＿＿ my home when you are free.
| A．in | B．on | C．in on | D．in at |
＿＿＿＿to my regret, I am unable to accept your warm invitation.
| A．Very | B．Much | C．Great | D．A lot |