You can pay now or ______ you come back to pick up the bike.
| A．then | B．when | C．while | D．as |
________wants to stay in a hotel has to pay their own way.
| A．Anyone | B．The one | C．Whoever | D．Who |
---I’m going to take part in the mid-term examination next week.
---_________!
| A．Congratulations | B．Be careful | C．Best wishes | D．Good luck |
The woman was about to open the door ____________ she heard a strange sound from inside.
| A．as | B．while | C．when | D．then |
We can see light in his office. He___________ be in his office.
| A．can | B．can't | C．must | D．might |
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 |