11 My father turned on the radio in order to listen to the news
=> _____so that_____
12 The whether is very bad, so all flights are cancelled
=> ______because______
13 John was lazy that he could not pass the exam
=> Because______
14 My father can reover very quickly. I am happy (adj clause)
=>
15 Why don't we collect waste paper to make the environment clean
=> I suggest______
16 They expect that the new system will begin operations by 2020
It______
17 they have known that Ha Long Bay is considered World Heritage Site
=> It_____
18 This book is the least interesting I've ever read
=> I have never____