In the botanical garden we can find a(n) __________ of plants that range from tall trees to small flowers.
Students are often warned that anyone who leaves the classroom at night must remember to _____ all the lights, or he will be fined.
____ he was not rich enough to buy whatever he wanted, Edison decided to make his new laboratory the best.
We still cannot persuade him to give up smoking ____ hard we tried.
____ we went those days when we were in the countryside, we were warmly welcomed.
A ____ road goes ____ from our village to the center of the town.