great scientist Yuan Longping is! He spent all his life on the research of rice.
| A． |
What |
B． |
What a |
C． |
How |
D． |
How a |
He __________computer games when his parents left home. So he didn’t know where they were.
| A．is playing | B．plays |
| C．played | D．was playing |
She promised that she could finish the work by ___________.
| A．her | B．herself | C．she | D．hers |
When our parents are not at home, we need to ______ ourselves.
| A．look after | B．look at |
| C．look up | D．look around |
The volunteers kept on searching for the missing people in the earthquake, _____they were hungry and tired.
| A．because | B．but | C．although | D．so |
--- Shall we take a bus to the library?
--- It’s not far. I think we________ take a bus. Let’s walk there.
| A．mustn’t | B．couldn’t |
| C．can’t | D．needn’t |