This is an illness that can result in total blindness ________ left untreated.
| A．after | B．if |
| C．since | D．unless |
Don’t forget where the emergency exits are _____an emergency.
| A．in place of | B．in favor of | C．in case of | D．in charge of |
The lake is calm and clear, and one of the things that _____in the water is the famous tower.
| A．reflects | B．reflect | C．is reflected | D．are reflected |
The roommates have lived for three years and not once _____with each other.
| A．they had quarreled | B．they have quarreled |
| C．have they quarreled | D．had they quarreled |
My hometown, _____I spent my happy childhood, has changed a lot.
| A．when | B．where | C．which | D．since |
_____that the girl with an incurable disease would die soon, the boy decided to help her make her last days beautiful and meaningful.
| A．Being found out | B．Found out | C．To find out | D．Having found out |