1 . Many lessons are now available online, from ___________students can choose for free. (用适当的词填空)

2 . John invited about 40 people to his wedding, most of ________ were family members. (用适当的词填空)

3 . In our school there are 50 students, half of __________ wear glasses. （用适当的词填空）

4 . She brought her three friends to the party, none of ________I had ever met before. (用适当的词填空)

5 . All the problems, _________expected, had been settled and the manager felt rather satisfied.(用适当的词填空)

6 . The science of medicine, _________which we owe a great deal, is perhaps the most important of all the branches of science. (用适当的词填空)

7 . The science of medicine, in_______ progress has been very rapid, is perhaps the most important of all the science.

8 . The doctor was very impolite to the patient, _______of course, made things even worse.

9 . Scientists have advanced many theories about why human beings cry, none of ______ has been proved. (用适当的词填空)

10 . By 16:30,________ was almost the closing time,nearly all the paintings had been sold. （用适当的词填空）