1、I discover that the most difficult thing in learning English is to____ it well.
A say B speak C talk D tell
2、What do you think____ in the future?
A happen B happens C will happen D to happen
3、Teachers and parents often____ our students to study harder.
A sugest B encourage C make D have
请说明理由,
不是说，speak 后面不能加it吗？