---So you were in the supermarket __________ you heard a strange sound, right?
---That’s true. I ran out as quickly as possible.
| A．when | B．while | C．then | D．which |
Do you know the girl ________ is standing under the tree ?
A. what B. which C. who
Han Han’s new book will ________ next month.
A. come out B. come on C. come in
– Would you like another piece of cake ?
-- _______ . I’m full.
A. That’s all right. B. I think so. C. No, thanks.
Mary prefers _______ to ________ .
A. sing, dance B. sing, dancing C. singing, dancing
Listen! There must be someone _________ through the jungle.
A. trek B. treking C. trekking