It was a real race _______ time to get the project done. Luckily, we made it.
| A．over | B．by | C．for | D．against |
Social attention should be paid ________our earth from________.
| A．to preventing; being polluted | B．to prevent; polluting |
| C．to prevent; being polluted | D．to preventing; polluted |
---What did your parents think about your decision?
---They always let me do_____ I think I should.
| A．when | B．that | C．how | D．what |
We don’t permit _______in the classroom; that is to say, students aren’t permitted ________in the classroom.
| A．to smoke; to smoke | B．smoking; smoking |
| C．smoking; to smoke | D．to smoke; smoking |
It was on October 3, 2011 _____ a big fire happened in Beijing, _____ was a great shock to lots of people.
| A．when; that | B．that; when |
| C．when; which | D．that; which |
When he entered the hall, he found the big desk ______with flowers and many people ______at him kindly.
| A．covering, staring | B．covered, stared |
| C．covered, staring | D．covering, stared |