—I often go to school by bike.
—Why not try ______ a bus？
| A．take | B．to take |
| C．took | D．taking |
My brother is studying in ______ university in America; he wants to be ______ astronaut in the future.
| A．a; a | B．a; an | C．an; a | D．an; an |
Now there are already robots _________ in factories.
| A．working | B．to work | C．work | D．worked |
Everyone except Tom and John ________ there when the class began.
| A．are | B． is | C． were | D． was |
Mr. Chang has ________ money but ________ friends than Mr. Chan.
| A．more; more | B．less; less | C．more; fewer | D．fewer; more |
Who broke the door? Let’s__________.
| A．look it out | B．find it out | C．take out it | D．keep out it. |