For your safety, you mustn’t get close to the train ________ it stops.
| A． |
while |
B． |
when |
C． |
since |
D． |
until |
— Is Lily good at singing? —Yes , she is．We often hear her_______ in the next room．
| A．sing | B．to sing | C．sang | D．Sings |
— Will you go to Sandy’s birthday party? — I won’t go unless Tony______．
| A．was invited | B．has invited | C．is invited | D．will be invited |
—_____will you stay here? —Until tomorrow afternoon．
| A．How long | B．How soon | C．When | D．How often |
My shoes are worn out．They need_______．
| A．to repair | B．be repaired | C．repaired | D．Repairing |
He hadn’t worked hard at his lessons．_______, he failed in the exam．
| A．As a result | B．However | C．Otherwise | D．Since then |