----Stay a bit longer, please. It's been such____pleasure having you here.----Thank you, but I've got____early start tomorrow morning.
—If he ___________, he ________that food. —Luckily he was sent to the hospital immediately.
When a pencil is partly in a glass of water, it looks as if it _______.
One learns a language by making mistakes and _______ them.
_____such heavy pollution already, it may now be too late to clean up the river.
—Will you stay for lunch? —Sorry, ____________. My brother is coming to see me.