--When _____ the abacus _____? -- In the sixth century by the Chinese people.
| A．is, invented | B．did, invent |
| C．was, invented | D．does, invent |
We can see__ old bike __the tree.
| A．a; under | B．the; at | C．a; on | D．an; under |
--Is your hat on the sofa?
| A．Yes, I am | B．No, it is | C．Yes, she is | D．Yes, it is |
--Where __ my pictures?--They’re on the desk.
| A．is | B．are | C．be | D．am |
--you like going swimming on weekends?
--No, I __
| A．Do; don't | B．Are aren't | C．Does; doesn't | D．Are; am hot |
--Do you know how to __ a beef sandwich at home?
--Sorry, I don’t know.
| A．buy | B．write | C．pour | D．make |