用所给动词的适当形式填空：
(employ, wait, happen, break, visit, play, take, save, learn, ask)
Much time ________ if you do it like that.
句型转换
His wife died, so that she left him with three children.
His wife died ________ ________ ________ three children.
Although he has a lot of money, he is unhappy.
He is unhappy ________ ________ a lot of money.
The teacher went out of the classroom, followed by his students.
The teacher went out of the classroom ________ ________ ________ by his students.
Being ill, he couldn't come to school today.
________ ________ ________ ________, he couldn't come to school today.
Water does not boil until it is heated to 100℃.
Water does not boil until ________ to 100℃.
Hearing the news, they were much surprised.
________ ________ ________ the news, they were much surprised.
It's a pleasure for me to be invited to speak here.
________ ________ ________ ________ invited to speak here.
Is there anything else I can do for you?
Can I help you ________ ________ ________ ________?
Those who act properly are welcome.
The people ________ ________ ________ ________ are welcome.