用括号内所给动词的适当形式填空。
____ Eighty students have entered the writing competition since it __________. (hold)
____ Girls, ________ (not be) nervous about speaking English.
____ His bike ______ ( break) down when he went to work yesterday.
____ I think more money ______(need) to carry on with our work.
____ The oil price________(rise) a lot in the past ten months.
____ While they _________ (prepare) for the exam tomorrow, the door bell rang.
____ It is important __________ (not feed) your goldfish too much food.
____ My teacher told me that light ________ (travel) faster than sound.
____ They were heard ______ ( sing) in the room just now.
____ The report says some animals can ________ (make) to work for people after training.