A well _______ presentation with a clear structure is easier for the audience to follow.
A. organize
B. organizing
C. organizes
D. organized
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By the end of this year Mr. Smith_______in our company for exactly three years.
A. is working
B. has worked
C. will work
D. will have work
l think that the Great Wall is worthhundreds of miles to visit.
A. to travel
B. traveling
C. traveled
D. travel
The new staff didn't know how to use the system ________l explained it to him yesterday.
A. until
B. because
C. if
D. since
The first question we now discuss is _______ we should go there early tomorrow.
A. whether
B. where
C. what
D. whom