is believed that improvement in health care will lead to a stronger , more prosperous economy .
| A．As | B．That | C．This | D．It |
----May I smoke here ?
-----If you , choose a seat in the smoking section .
| A．should | B．could | C．may | D．must |
I like getting up very early in summer. The morning air is so good .
| A．to be breathed | B．to breathe | C．breathing | D．being breathed |
-----She looks very happy. She have passed the exam.
------I guess so. It’s not difficult after all.
| A．should | B．could | C．must | D．might |
----Did Peter fix the computer himself?
-----He , because he does know much about computers.
| A．has it fixed | B．had fixed it | C．had it fixed |
D．fixed it |