【单选题】
A: [填空] when you cross the street. Theres so much traffic. B: Yes, I will.
【单选题】
A: Its getting late. Im afraid I must be going now. B: Ok. [填空].
【单选题】
A: Do you know Marks phone number? B: [填空] . A: OK. I might as well look it up in the phone book.
【单选题】
A: Why didnt you come to my party last night? B: Im sorry, [填空]. I had to visit my grandmother at the hospital.
【单选题】
A: I like this flat very much, but Id like to come and see it on Friday at 5 oclock. Will that be convenient? B: [填空].
【单选题】
Im interested ___________ playing basketball.
【单选题】
I wish I[填空] young again.
【单选题】
A: I need to buy a wedding gift for Jane. B: Should we stop at the shopping center? A: [填空]. The weddings not until next week, but I wont have time later to get them anything.
【单选题】
A: I thought you were working until 6:30. B: [填空], but we finished our meeting at 5:30 and were let go.
【简答题】
(a, b)[a, b] = [填空].