—How do you plan to go for your next trip?
—I'm not sure. I ______ take a plane.
| A．may | B．must | C．need | D．shall |
Look at the sign _______! We shouldn't park our car here.
The telephone rang_______ Jenny was practicing the violin.
A. until B. before C. while
--- Hi, David. _______do you go to see your grandparents?
---About three times a month.
A. How long
B. How often
C. How soon
The year of 2013 saw the_______ air pollution in China for 52 years.
A. bad B. worse C. worst
--- Do you know if Tom_______ to Lily’s birthday party last Sunday?
--- Sorry, I've no idea.
A. is invited
B. was invited
C. invited