_______ nice weather it is to have a picnic!
A. What B. What a C. How D. How a
They had to ________ the meeting hurriedly because time was up.
A. hold B. contain C. conclude D. take place
This sign warns the people who study in the library __________.
A. don’t speak loudly B. not speak loudly
C. to not speak loudly D. not to speak loudly
Doctor Ray, as well as other scientists __________ trees for nearly 15 years, but they know only a little about them.
A. study B. studies C. has studied D. have studied
The TV is on, please don’t forget __________ when you leave.
A. to turn off it B. to turn it off
C. turning off it D. turning it off
Benny likes playing tricks ___________ others.
A. on B. at C. for D. to
