He telephoned the travel agency to ___ three air tickets to London.
| A．order |
| B．arrange |
| C．take |
| D．book |
Actions __________ walking and drinking are quite difficult in the moon.
| A．for example | B．such as | C．including | D．liking |
Keep ______. The camera is ready.
| A．still | B．calm | C．quiet | D．silent |
catch the first bus, he got up very early this morning.
| A．In order to | B．In order that | C．So as to | D．So that |
The number of people invited to the party _____ sixty, but a number of them ______absent.
| A．were; was | B．was; was | C．was; were | D．were; were |
He likes to help others ________ he is very busy.
| A．because | B．if | C．even | D．even if |