________with so much trouble，we failed to complete the task on time.
| A．Faced | B．Face |
| C．Facing | D．To face |
The soldiers have to stand for hours without changing.
| A．position | B．situation | C．location | D．condition |
Last night’s TV news said that by then exact evidence for the missing plane MH370.
| A．had not been found | B．had not found |
| C．has not been found | D．has not found |
“Your homework is all right; , you can do it better, I think.” said the mother.
| A．but | B．while | C．however | D．though |
Birds singing is sometimes a warning to other birds away.
| A．Stay | B．staying | C．stayed | D．to stay |
The famous musician, as well as his students, to perform at the opening ceremony of the 2012 Taipei Flower Expo.
| A．were invited | B．was invited | C．have been invited | D．has been invited |