—Hi.Danny! Are you going for a picnic this weekend?—I’m not sure._____________.
He left the place, _____never _______back again.
The government is trying to do something to _______ better understanding between the two countries.
-- Excuse me, may I ask you some questions? -- Sorry, I’m too busy and I haven’t even a minute to _______.
I tried phoning her office, but I couldn’t ______.
There _____ a lot of coal mines in the south, but many of them have been closed or are _____ be closed.