____ on Monday night that all this happened?
| A．Is it | B．It is | C．Was it | D．It was |
To my delight, the students are recycling many things they ______ away in the past.
| A．were throwing | B．will be throwing |
| C．had thrown | D．would have thrown |
Sue is always finishing her task well within the shortest time. ______, she performs effectively.
| A．In other words | B．On the contrary |
| C．Sooner or later | D．On the other hand |
China has made ______ clear to the world that in the course of its development it seeks for both golden, silver hills and clean water, green mountains as well.
| A．this | B．that | C．it | D．One |
The visitors were admiring the charming flowers ______ it started to rain.
| A．as | B．since | C．while | D．When |
The teacher didn’t imagine that a student good at maths ______ have failed in the exam.
| A．must | B．might | C．need | D．Should |