We're still at the airport. If it weren’t for the delayed flight, we _____the concert right now.
Nowadays people sometimes separate their waste to make it easier for it ________.
At the age of 29,Dave was a worker,________ in a small apartment near Boston and ________ what to do about his future.
When he ________ the door,he found his keys were nowhere.
In April,2009,President Hu inspected the warships in Qingdao,________ the 60th anniversary of the founding of the PLA Navy.
________ not to miss the flight at 15:20,the manager set out for the airport in a hurry.