I will never forget the fire ______________ happened in Shanghai last year.

In that school, English is compulsory for all students, but French and Russian are _______.

The heavy snow lasted a few days so that many villages were cut off, thus causing much inconvenience to the villiagers

Is it going to be colder tomorrow— Yes. The radio says it will be five zero.

m, what did you do this summer vacation—Guess what I had ______great fun in _______show performance “ Voice of China” .