The scientist________ the behavior of the mice after they were given the drug.
| A．looked |
| B．observed |
| C．noticed |
| D．watched |
I looked under____bed and found____book I lost last week.
| A．the; a | B．the; the | C．不填；the | D．the; 不填 |
The practice of hanging clothes across the street is a common ___ in many parts of the city.
| A．look | B．sign | C．sight | D．appearance |
Theboxofrubbers____white.
| A．is | B．are | C．be | D．were |
Noneofthatmoneyonthetable____mine.
| A．is | B．are | C．been | D．were |
Ithinkmaths____veryinteresting.
| A．are | B．is | C．sound | D．seem |