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－How long did it ________ you to work out the difficult maths problem?

－I ________ about half an hour on it．

A．take; took

B．spent; took

C．spent; cost

D．take; spent

－Look at the sign．It says“No Parking”．－Sorry, ________．

A．I haven't seen it

B．I hadn't seenit

C．I didn't see it

D．I won't see it

－Could you look after my daughter ________?

－No problem．

A．when I leave my home

B．when I am leaving my home

C．while I am away from my home

D．while I leave my home

－Could you tell me which floor ________?

－He lives on the fifth．

A．does Mr Wang live

B．does Mr Wang live on

C．Mr Wang lives on

D．Mr Wang lives

－Could you tell me how long ________?

－For about two hours．

A．has he fallen asleep

B．he has fallen asleep

C．has he been asleep

D．he has been asleep

－Didn't the robot have a rest?－________．Because it never gets tired．

A．No, it did

B．Yes, it did

C．No, it didn't

D．Yes, it didn't