With efforts _______ conservation, we may believe that people enjoy a healthy life without the environment around them ________.
| A．focused on; suffering | B．focusing on; suffering |
| C．focused on; being suffered | D．focusing on; suffered |
— You have helped me a lot. I can’t thank you enough.
—______.
| A．Be my guest. | B．That’s right. | C．I don’t think so. | D．Think nothing of it. |
I didn't realize my mother loves me so such until I received her gift for my 18th birthday, a diary______ the process of my growth．
| A．recorded | B．to record | C．recording | D．having recorded |
_____ the city’s public school system should be open to the children of migrant workers has become the focus of discussion.
| A．That | B．What | C．Whether | D．If |
—You may find the key to the math problem on page 107．
—Ah, it's so simple. I wonder why I _____ of that．
| A．hadn’t thought | B．haven't thought | C．didn't think | D．wasn't thinking |
Cars do cause people some health problems, in fact far more serious _____ than computers do.
| A．one | B．ones | C．it | D．those |