We won’t forget the financial crisis and the troubles _______ has caused to the people all over the world.
It took me quite a long time to ________ the new environment here.
He made another wonderful discovery, ______ of great importance to science.
Would it be ________ for you to pick me up at four o’clock and take me to the airport?
______ by the clear waters, this forest provides visitors with a wonderful chance to see some endangered birds in the wild.
----Guess what, we’ve got our visas for a short term visit to the UK this summer.---How nice! You ______ a different culture then.