Don’t get the plastic tube close to the fire; it ______ easily.
#100178
A
burned
B
is burned
C
burns
D
is burning
推荐题目
No sound and no voice______ for a while. 
#104900
A
have heard
B
has heard
C
has been heard
D
have been heard
. Tom as well as his classmates __________ a song when the teacher came into the classroom.
#103734
A
are singing
B
were singing
C
is singing
D
was singing
Peter ________ at this job since he graduated from college.
#99363
A
is employed
B
was employed
C
has been employed
D
had been employed