Complete the sentences with prepositions: One … (1) the professors … (2) our University is known … (3) his work … (4) the field …
(5) geology. He finished the school … (6) Pittsburg and entered the Colorado School … (7)
Mines. … (8) the School he studied the full range … (9) subjects relating … (10) geology
and mining. … his practical training he visited many coal-fields and collected materials …
(11) his graduation paper … (12) the stratigraphy … (13) the Rocky Mountains. After
graduating … (14) the Colorado School … (15) Mines he worked as a geologist … (16) the
territory … (17) Colorado. He studied the geological systems … (18) various regions … (19)
the USA.

1. Are the picking mushrooms in the forest right now?

Are they picking mushrooms or berries in the forest right now?

Who is picking mushrooms in the forest right now?

What are they picking in the forest right now?

They are picking mushrooms in the forest right now, aren't they?

Have they drawn a nice picture today?

Have they drawn a nice or bad picture today?

Who has drawn a nice picture today?

What have they drawn today?

They have drawn a nice picture today ,

haven't they?

Does our teacher give us a day off sometimes?

Does our teacher or mother give us a day off sometimes?

Who gives us a day off sometimes?

What does our teacher give us sometimes?

Sometimes our teacher gives us a day off, doesn't she?

N1
1. Are they picking mushrooms in the fret right now?
2. They are picking mushrooms in the fret right now, aren't they?
3. they aren't picking mushrooms in the fret right now, are they
4. Who is picking mushrooms in the fret right now?
5. Where are they picking mushrooms in the fret right now?
6. Why are they picking mushrooms in the fret right now?
N2
1. Have they drawn a nice picture today?
2. They have drawn a nice picture today, have not they?
3. They have not drawn a nice picture today, have they?
4. Who has drawn a nice picture today?
5. Where have they drawn a nice picture today?
6. Why have they drawn a nice picture today?
N3
1. Does sometimes our teacher give us a day off?
2. Sometimes our teacher gives us a day off, doesn’t she(he)?
3. Sometimes our teacher doesn’t give us a day off, does she(he)?
4. Who sometimes gives us a day off?
5. Where does sometimes our teacher give us a day off?
6. Why does sometimes our teacher give us a day off?