Ex1

1. Although the test was very difficult, we could do it.

 The test was very very difficult but we could do it.

2. We couldn't do the test because it was very difficult

 The test was very difficult so we couldn't do the test.

3. My mother wanted me to have breakfast so she woke me up early.

   My mother woke me up early since she ....

4. We are saving money so as to buy a new house

  We are saving money as we want to.....

  We want to buy ......so we are saving money.

5. Her hobbies are playing badminton and collecting stamps.

6. He didn't take along a raincoat so....

   They got wet because he didn't take.....

7. Though he took along a raincoat, they got wet 

    He took along a raincoat but they got wet

8. They got lost because they didn't have a map

 They didn't have a map so they got lost 

9. They got lost even though they had a map

They had a map but they got lost.

10. He was tired so he didn't....

He didn't.... because he was tired

Ex2:

1.before, 2.while, 3. so that, 4. because, 5.while, 6. although, 7. because, 8. as soon as, 9. although, 10 so that