If you ____ your money ____ mine, we will have enough to buy one more set of stamps to ____our collection.
| A．join; in; add | B．add; to; add to | C．put; to; add up | D．add; in; add up to |
Nowadays people sometimes separate their waste to make it easier for it ______．
| A．reusing | B．reused | C．reuses | D．to be reused |
At the age of 29, Dave was a worker, ______ in a small apartment near Boston and ______ what to do about his future．
| A．living; wondering | B．lived; wondering |
| C．lived; wondered | D．living; wondered |
When he ______ the door, he found his keys were nowhere．
| A．would open | B．opened | C．had opened | D．was to open |
In April, 2009, President Hu inspected the warships in Qingdao,____the 60th anniversary of the founding of the PLA Navy．
| A．marking | B．marked | C．having marked | D．being marked |
___not to miss the flight at 15:20, the manager set out for the airport in a hurry．
| A．Reminding | B．Reminded | C．To remind | D．Having reminded |