【推荐1】________ (know) what not to do is also very important. （所给词的适当形式填空）

【推荐2】It feels good_______________(know) that when we are out of the town, our neighbors are keeping an eye on our house for us. (所给词的适当形式填空)

【推荐3】I __________(know) Dr. John for a long time, maybe since he worked in that university. （所给词的适当形式填空）

【推荐1】It’s the responsibility of scientists, knowing the great progress is the fruit of freedom of thought, ________ (declare) the value of this freedom. (所给词的适当形式填空)

【推荐2】Being a teacher, it is a privilege ________ (help) students to obtain knowledge and better themselves. （所给词的适当形式填空）

【推荐3】It will take us several years _____ (learn) a foreign language well. (所给词的适当形式填空)

【推荐1】It is important to ________(assessment) our suitability for a certain career. （所给词的适当形式填空）

【推荐2】These sounds seemed ________ (be) from another world and the child listened to them with wonder. (所给词的适当形式填空)

【推荐3】Wherever he is, he makes it a rule ________（take） part in physical labour. （所给词的适当形式填空）