Professor Smith，along with his assistants，___________ on the project day and night to meet the deadline.
| A．work | B．working | C．is working | D．are working |
---Why does she always ask you for help?
---- There is no one else ________________, is there?
A. who to turn B she can turn to C. for whom to turn D. for her to turn
People ______ at the meeting would have a discussion on pollution.
| A．were present | B．took part in | C．join in | D．present. |
Our English teacher requested that the homework _______ tomorrow morning.
| A．would be handed in | B．be handed in | C．hand in | D．must be handed in |
Is this the reason ___________ at the meeting for his carelessness in his work?
| A．he explained | B．what he explained | C．how he explained | D．why he explained |
.Whenever we are in ________ , we must never lose ______ , but try to think of the way out.
| A．the trouble; our heart | B．troubles; hearts | C．trouble; heart | D．trouble; our heart |