Hundreds of people gave their lives in _____ of freedom.
| A．protection | B．guard | C．defense | D．favor |
He made another wonderful discovery, ______ of great importance to science.
| A．which I think it is | B．which I think is |
| C．which I think | D．I think which is |
Would it be ________ for you to pick me up at four o’clock and take me to the airport?
| A．free | B．vacant | C．handy | D．convenient |
______ by the clear waters, this forest provides visitors with a wonderful chance to see some endangered birds in the wild.
| A．Being surrounded | B．Surrounding | C．Surrounded | D．To be surrounded |
----Guess what, we’ve got our visas for a short term visit to the UK this summer.
---How nice! You ______ a different culture then.
| A．will be experiencing | B．have experienced |
| C．have been experiencing | D．will have experienced |
It’s cold here. _________ I switch on the heating?
| A．Should | B．Will | C．Would | D．Shall |