Ⅰ.单句语法填空
1．He is so stubborn that no one can persuade him.
2．Neither the father nor the son is (be) interested in the film.
3．There is no doubt that the plants benefited from the rain.
4．In order to save energy, they have decided to cut down the gas supplies to the city.
5．David, I'm tired of watching television; let's go for a walk.
6．The speed of cars and trucks is limited to 30 kilometers per hour in large cities in China.
