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yer.A. be B. am C. to be ( )7.—How long has your mother been cooking for your family?—______ ten years.A. For B. Since C.. As( ) brother _____ listening to light music.A. is interested B. is interested in C. is interesting in( )9.—______have you been collecting stamps?—Four years.A. How often B. How long C. How many( ) ______ in this school since ten years ago.A. have e B. have been working C. work( ) has been practising the violin ______ 1999.A. for B. since C. in( )12.—Where is your father,Jim?—He ______ Hong Kong.A. has gone to B. has been to C. goes( ) has been skating ______ two hours.A. for about B. since C. in( )39。(10分)。 I _______ _______ the book _______ ten years ago.( ) 16. Cartoons are very ________, so I am very _______ in them.A. interested, interesting B. interesting, interested C. interested, interested D. interest