一、单项选择（5分）
1. I _________ breakfast when he telephoned me.
A. have B. am having C. had D. was having
2. The bus driver always says to us, “Don’t get off ________ the bus stops.”
A. since B. while C. until D. after
3. Jane often helps her mum wash the _______ in the kitchen after dinner.
A. wound B. dishes C. clothes D. vegetables
4. Ben was busy taking a training class, _________ we had to wait for him for half an hour.
A. so B. because C. although D. but
5. -- Excuse me, may I use your dictionary?
-- Sorry, I have no dictionary.
