The boys followed the marks that they ________, until finally they found their way back to the campsite.
| A．left | B．have left | C．had left | D．have been left |
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I am really a bit worried because I have no idea what my parents’ will be to my poor examination result.
| A．expression | B．reaction | C．appearance | D．expectation |
Onlywhenonelosesfreedom _______itsvalue .
| A． doesoneknow | B．onedoesknow | C．doesknow one | D．knowonedoes |
Well let you use the room ______you keep it clean and tidy .
| A．even though | B．on condition that | C． if | D．however |
Is thisthe research center _____you visited thelablast year ?
| A． which | B． the one | C．that | D．where |
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