The car accident happened ____ a cold winter morning. Luckily, no one was hurt.
| A．in | B．on | C．at | D．of |
）—Grace, come and have a hamburger.
—No, thanks. I don’t want to be ________.
| A．fat | B．tall | C．old | D．thin |
）Come and have a look at these bags in red. We sell them _____ very good prices.
| A．in | B．at | C．for | D．of |
）—Are your __________ workers (工人)?
—No,.
| A．friend; they aren’t |
| B．sister; they are |
| C．grandparents; they aren’t |
| D．parents; they are |
—________ is the math book?
—It’s in the bookcase.
| A．What | B．Where | C．Why | D．When |
）—Is this girl your sister?
—_________.
| A．No, she is. | B．Yes, it is. |
| C．Yes, she isn’t. | D．No, she isn’t. |