阅读下面材料，在空白处填入1个适当单词或括号内单词的正确形式。
The Moon's near side, the one we all see,
has been the target
of many robotic and human missions. However, its far side, also {#blank#}1{#/blank#} (call)the dark side because it faces
away from the Earth and little {#blank#}2{#/blank#} (know)about it, has never been explored. That changed
on Jan.2, 2019,
when Chinese
spacecraft Chang'e 4 made a soft landing on {#blank#}3{#/blank#} is often referred to as the dark side.
The landing is {#blank#}4{#/blank#} example of China's growing desire {#blank#}5{#/blank#} (compete)with the American,
Russian and European
space programs. China also wants to {#blank#}6{#/blank#} (strength)its position as a regional
and international power.
One of the great {#blank#}7{#/blank#} (difficulty)in exploring the far side
of the Moon is that it blocks all radio signals, {#blank#}8{#/blank#} (make)it impossible to communicate
with the Earth. To overcome this difficulty, in 2017, the Chinese National Space
Administration launched a satellite to orbit the Moon and relay the signals. Once
a {#blank#}9{#/blank#} (rely)communication path was in place,
Chang'e 4 could send back information.
Chang'e 4 will make astronomical observations
and examine the structure and mineral composition of the ground above and below
the surface, {#blank#}10{#/blank#} researchers believe will provide
insights into the solar system's early days and perhaps even the
origin of the first stars.
