1a) but

1a) or

2a) and 

2b) but

3a) or

3b) and 

4a) and 

4b) because

EX.2 

1) while

2) until

3) after

4) when 

5) until

6) while 

EX.3

1) Even if he is tired he can't sleep 

2) Although it's expensive, I'm going to buy it anyway 

3)Although she works hard, she doesn't eaen much money 

4) Although Dave as a car, he prefers cycling

5) Although we played badly, we won

6) Although she borrowed my pen, she didn't say thank you

7) Although I recognize her, I couldn't remember her name

EX.4

1) Andrea is listening to the radio

2) Does sara play the guitar?  

3) Isabel has not arrived

4) The sun has come out

5) We like Lebanese food

6) What languages can Daniel speak? 

7) Jim plays the clarinet

8) Thris is a nurse 

9) She looks really unhappy

10) Rita can't speak any Serbain

EX.5 

1) This is the exam which I did really badly in

2) Stefano is the student who I studied with

3) This is the library which we go for quiet study

4) Rita is the teacher who my cousin's married to 

5) This is the song which we had listen to in class 

EX.6 

1) Shall I put these pictures in the bin or shall I save them, Alison?

2) Correct

3) I need bread. Can you pass me it? 

4) Correct

5) I'm really hungry. Can you get me some chips.

6) Correct

7) Jason enjoyed looking at that book today, perhaps could you lend him it for a couple of days? 

8) Correct

EX. 7 

1) The managers didn't like the proposal, so the workers 

2) A few people in my department speak french, so do I 

3) b) Don't worry I can't make it neither 

4) b) Yes so do I