Here are the suitable prepositions to fill in each blank:

1. by (You should learn the irregular verbs **by** heart.)
2. for (Please wait **for** us outside the school gate.)
3. in (How many girls are there **in** your class?)
4. for (Many thanks **for** your letter. I’m pleased to hear **from** you.)
5. off (Please turn **off** the lights **for** me. It’s getting dark.)
6. from (It’s a bit far **from** my house to school.)
7. at (My friends sometimes laugh **at** my jokes.)
8. with (Our new teacher is slim **with** long black hair.)
9. at (I used to live **at** a farm and look **after** my younger brother.)
10. to (You must go **to** the airport before it’s too late.)

Feel free to reach out if you need help with the second part of the exercise as well!