Her mother was ill so she had to look after her________.
| A．day and night |
| B．day by night |
| C．day after night |
| D．day in night |
—What has made John look like lacking sleep?
—________ he had to prepare for the coming exam and stayed up last night.
| A．For | B．Because |
| C．That | D．What |
Everyone is different and that is ________ makes our world much better.
| A．that | B．which |
| C．who | D．what |
The most impressive sites of Chishui Danxia are its various waterfalls, ________ the Shizhang Waterfall is the largest one.
| A．for which | B．in which |
| C．from which | D．of which |
Many people tried to leave the country, ________ there was much violence and a serious shortage of food supply.
| A．where | B．which |
| C．that | D．what |
After visiting Harbin, most of the foreign friends said they would never forget the time ________ they had spent.
| A．that | B．what |
| C．when | D．at which |