The timetable says the school bus _________ here for the first trip at 6:30 am.
| A．will leave | B．left | C．is leaving | D．leaves |
In the past decades, sea ice _____in the Arctic as a result of global warming.
| A．had melted | B．has been melting | C．melted | D．is melting |
In our country the cold weather in the north_____ sharply _____the hot weather in the south.
| A．combines；with | B．relates；to | C．compares；with | D．contrasts；with |
_____of danger in the street at night, she had to go home, with a friend_____ her.
| A．Warned; accompanied |
| B．Warning; accompanying |
| C．Having warned; accompanied |
| D．Having been warned; accompanying |
I don't doubt _____ he will pass the exam.
| A．whether | B．that | C．when | D．how |
The problem of global warming is serious. _____ , the sea levels have _____a little.
| A．As a consequence; risen |
| B．On the contrary; arisen |
| C．On the other hand; arisen |
| D．In other words; risen |