On April 12, 1961,_____27—year—old Yuri Gagarin(尤里.加加林)became the first human to go into_____ space.
of four buses will take you to the station . We can take of them .
It’s time since we met last .
In order to let more people pay attention to their plan, they _________ some signs on the wall.
—Look out! Don’t run the red light when crossing the road next time. —_______________.
To solve the traffic problem, more and more bridges ____________ across the river every year.