Spacecraft________ made ________ possible for humans to research into the universe.
A.have; it B.has; it C.have; that D.has; that
The Queqiao satellite(卫星)will form a ________ bridge between controllers on the Earth and the far side of the Moon.
A.contribution B.communication C.celebration D.construction
Nick's brother________the navy in 2011and ________the navy since then.
A.joined; has joined B.joined in; has joined in
C.joined in; has been in D.joined; has been in
Be patient! Give him more time，______he will find the answer to the question on his own.
A.but B.or C.and D.so
In front of these houses a river, which is not wide or deep but very clean.
A.stand B.stands C.run D.runs
He is always ________ come and ________ leave.
A.first; last B.first to; last to
C.the first to; the last to D.the first of; the last of
