The clock has just _________ twelve. All the teachers should stop _________ and let the students have a rest.
A good speaker is supposed to manage to ________ the listeners what he means.
----Whose advice do you think I should take? ----________.
Leaves are found _______ all kinds of trees, but they differ greatly ________ size and shape.
To save class time, our teacher has ________ students do half of the exercises in class and complete the other half for our homework.
Darwin counted 225 flowering plants, ________ he collected and brought home 193.