Please do me a favor — ______ my friend Mr．Smith to Youth Theater at 7:30 tonight．
A．to invite B．inviting C．invite D．invited
6．
Nowadays people sometimes separate their waste to make it easier for it ______．
A．reusing B．reused C．reuses D．to be reused
5．
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
4．
When he ______ the door, he found his keys were nowhere．
A．would open B．opened C．had opened D．was to open
3．
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
2．
___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
