We _______ many roses in the garden since last year.
#38295
A
plant
B
planted
C
have planted
D
are planting
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There  _______ an English party this weekend.
#41823
A
is
B
are
C
is going to be
D
is going to have
Mr. Wu___this math problem____him many times, but he still doesn’t understand it.
#38768
A
explains ; to
B
has explained ; for
C
has explained ; to
D
explained ; with
We will go for a picnic if it_____ this weekend. 
#36947
A
will rain
B
rains
C
won ’ t rain
D
doesn’t rain