1.我发现养真正的狗作为宠物是困难的,因为它们大部分都需要特殊关爱.
1.我发现养真正的狗作为宠物是困难的,因为它们大部分都需要特殊关爱.
I found it ------ -------- -------- real dogs ------- pets because most of them ------ -------- --------.
2.There’s someone knocking at the door.
There’s ------- ---------- on the door.
3.You must finish your homework before you go to bed.
------- --------- that you ---------- your homework before you go to bed.