It's high time that we students ______ even harder at our lessons as the national entrance examination is coming nearer.
It is ______ that the US president will visit our country next month.
--- Do you mind if I open the window? --- ________ I feel a bit cold.
The brain ___________ grey and white matter, _______ weighs just over a kilo.
What____ you _____this time tomorrow?
To put it simply, if you want to be ________ success in the business world, you need ______ high level of English competence.