The situation will become worse and worse ________ the government takes actions to protect the environment.
| A．if | B．unless |
| C．though | D．until |
---Do you like volleyball?
---Yes,. It’s interesting.
| A．I do | B．I don’t | C．it is | D．it isn’t |
We usually have our school tripa morning of April1st.
| A．in | B．at | C．to | D．on |
He hasegg andhamburger.
| A．an, an | B．a, a | C．an, a | D．a, an |
Not everyone knows_____they want to be.
| A．what | B．how | C．where | D．why |
Science is _____ difficult for some students ____ learn, so many of them don’t like it.
| A．enough, to | B．too, to |
| C．so, to | D．much , to |