Most birds find it safe to sleep in the trees, but __________ they have eggs or young chicks, they don’t use a nest.
.__________, we would not have achieved so much.
How long___ stay with the company depends on___we’re satisfied with each other.
No.50 High School is as new as No.48 High School.____, it is more beautiful.
.It will be about three years________next Olympic Games are held.
__________ the traffic jam, he arrived on time.