Bamboo(竹子)is made ______ pipes(管道)______ carrying water______ some farmers in the countryside.A. by; for; into B. for; by; into C. into; for ; by
---Do you know about a very popular toy--- the yo-yo(悠悠球)? ---Yes. Filipinos(菲律宾人) invented it ________ accident. And it ________ helping kill animals.
To make our city more beautiful, a large number of trees ________ in the mountains last year.
---Our hometown develops so fast. ---That’s true. Great changes ________ there in the past few years.
---Mario used to be short, didn’t he? ---________. But now he is tall.
---Do you know if we ________ a picnic next week? ---I’m not sure. But if it ________ raining, maybe we will.