Complete the following sentences with before, after, when, though, if ,because, or so that. 1._________ you pay for the goods , you’d better check it carefully. 2. You need to look at the price carefully ________ you are shopping. 3.__________ I walked for a whole day. I was really tired. 4.____________ he answered my question . I was still confused. 5._____________ you pay with the credit card, you can get a 5% discount. 6.He left the door open _________ his dog can enter by herself. 7.I couldn’t feel anger against him _______ I like him so mach.