I’m sorry to have kept you________for almost two hours．
| A．wait |
| B．to wait |
| C．waiting |
| D．waited |
---Is this your ruler？---______.
| A．Yes,it's | B．Yes, it isn't |
| C．No, it isn't | D．No,it is |
----Your backpack is very nice.
----________.
| A．Yes | B．No | C．Thank you. | D．Sorry |
-- _______.Is this your book?
| A．Sorry | B．Thanks | C．Excuse me | D．No |
___are his sisters.
| A．She | B．He | C．They | D．That |
Linda and I ____friends.
| A．Be | B．am | C．is | D．are |