You looked unhappy just now．_____？
I missed the school bus and arrived late for class．（ ）
| A． |
What did you eat for lunch |
| B． |
How was your picnic |
| C． |
What happened to you |
| D． |
How did you go there |
The policeman asked us _____him send the old man to the hospital.
| A．help | B．helps |
| C．helping | D．to help |
（）If there _____ no buying and selling of animals, there will be no killing in nature.
| A．is | B．will be |
| C．has | D．will have |
In summer milk will quickly go bad_____ it is put into a fridge.
| A．though | B．unless | C．because | D．once |
I still remember my first teacher we haven’t seen each other for many years
| A．for | B．because | C．since | D．though |
I’m sorry I’m very busy now.If I ______ time, I ______ come to see you.
| A．have, would | B．had, will |
| C．were, will | D．have, will |