The boy is waiting ____ his sister and they will go to the hospital to wait ____ their sick mother.
| A．for,on | B．on,for | C．for,for | D．on.on |
It was because we went on separate ways ________ I felt relieved.
| A．that | B．when | C．how | D．which |
The teacher taught us to find a planet in the solar system in his last lesson, ________ everything through jokes.
| A．having explained | B．explained |
| C．to explain | D．explaining |
Basically, we don’t need heaters in Chongqing, but it ________ be very cold in winter.
| A．must | B．will | C．shall | D．can |
The most successful students are usually ________ who come to all the classes.
| A．that | B．those | C．them | D．one |
We have positive opinions on human rights, which is exactly________ they disagree on.
| A．what | B．how | C．where | D．that |