______you are always optimistic and self-confident, I can't wait to make friends with you.
#30869
A
Though
B
Since
C
While
D
So
推荐题目
______ he has made a decision, it is not easy for you to make him change his mind.
#31776
A
Though
B
Unless
C
Until
D
Once
In America, many people waste a lot of food _____ in Africa people haven’t enough to eat.
#33108
A
however
B
although
C
as
D
while
___ is the most useful invention?
#32091
A
Do you think which of these
B
Which of these you know
C
Which of these do you know
D
You know which of these
You shouldn’t accept a gift from a person _____ you don’t know him.
#31530
A
until
B
unless
C
if
D
whether