Sentence Correction

26) The natural lakes are drying; it must not had rained.

1. must not have
2. must not has
3. must have not
4. was not

27) You will fail if you not start studying now

1. does not start
2. do not start
3. have not start
4. has not start

28) All the charges of corruption leveled on him were found baseless.

1. level against
2. leveled with
3. leveled over
4. leveled against

29) He is as tall if not taller than his brother.

1. as tall as if not
2. as tall if not
3. not so tall but as
4. None of the above

30) For a few days, the new teacher lectured across the heads of the students.

1. on the heads
2. over the heads
3. over the head
4. through the heads of