课时提升作业(十)
必修4 unit 1
ⅰ. 单项填空
1. (2014•温州模拟)it is often recommended that children chances to get close to nature.
a. are offered b. be offered
c. should offerd. must be offered
2. they printed legacy on their own and worked tirelessly to it online and in schools, libraries and bookstores.
