The Harry Potter books are quite popular; they are in great ___ in this city.
| A．quality |
| B．progress |
| C．production |
| D．demand |
Without proper lessons, you could _______ a lot of bad habits when playing the piano.
| A．give up | B．catch up | C．pick up | D．keep up |
It suddenly _________ to the detective that the millionaire was probably murdered by his own daughter.
| A．happened | B．occurred | C．thought | D．took place |
It’s helpful to put children in a situation ________ they can see themselves differently.
| A．that | B．when | C．which | D．where |
You will find this map of great ________ in helping you to get around Beijing.
| A．valuable | B．value | C．helped | D．cost |
---Where is George? He said he would meet me here at 3 o’clock.
---He seems ________ with Mr. Brown in the office.
| A．to talk | B．to have talked | C．to be talking | D．to be talked |