While listening to the concert, the audience is required to remain ______ and keep quiet.
Every weekend, there is a meeting and our head teacher, with five of us, ____ it.
– Is everybody here? – Not yet… Look, there ____ the rest of our visitors!
The scientist’s many years’ careful observation ____ a surprising discovery.
Don’t come and see me today – I’d rather you ____ tomorrow.
It is clear that your ____ English will greatly improve if you can practice ____ wherever you can.