Now that their parents are dead, the poor boy doesn’t know ________ the money they left.

I’m sorry I can’t find the library book anywhere.— So…I’m afraid you have to _________ it.

There are about teachers in our school.

Shall we meet at the station at 8 a.m.?—In fact, we __________. The train ________ until 10 a.m.

－Miss Gao is popular among the students.－Yes. Her classes are always and interesting.