用括号中数词的正确形式填空: 1. I have___(4) bags of rice. A. four B. four C. forty D. fourth 2. Tom is___(12) years old now. A. twelvfth B. eleven C. thirty D. twelve 3. We need___(15) baskets to carry these eggs. A. fif B. five C. tifty D. fivety 4. She oftenspends ___(18) hours on playing computer s. A. eight B. eighty C. eith D. ten eight 5. The bridgeis ___(40) meters long. A. four B. four C. forty D. fourth 6. The chaircosts ___ (99) dollars. A. ninety-nine B. nine C. nine-nine D. nine-nine