–May I go to the concert with you?

– I’m afraid not ______you have a ticket, because I have only one.

A. since        B. if        C. unless    D. though

--Excuse me． May I speak to Mike, please? --______________．

根据句意及汉语提示写出正确的单词或短语。(5分)

1.This is Jason. He is my ________ (朋友).

2.May I have your ________ (橡皮)?

3.Let’s sit on (在……上) the ________ (椅子).

4.Is that your ________ (图书馆)?

5.Please ________ ________ (起立), Danny.

---Mum ,____________ May I borrow your camera ?

     --- Sure ,here it is .

A. please help me           B. can I ask a favour ?

C. where is your camera ?    D. excuse me .

—May I swim here?  
— No, you _______.  It is dangerous.