Bài 2: Hoàn thành những câu sau đây bằng những liên từ cho sẵn. since although while unless before as though when as long as because in case 1.________when______ Jim came home, he realized that someone had broken into his house 2.You’d better bring your raincoat in case rain pour down. 3.They have been colleagues_______________ they graduated. 4._____unless_______ Tim put more effort in his studying, he won’t catch up with his classmates. 5.My mother always reminds me to wash my hands____before_________ I have meals. 6.We will go picnicking________________ the weather is fine. 7.James behaved______________ nothing had happened. 8.I can’t make it on Saturday_____________ I will be fully occupied. 9.When I got home my father was moving the lawn__________ my mother was watering the flowers beds. 10.______although_______ I don’t get on well with Mary, I really admire her inteligence and beauty.