Без проблем:
№3
1. The cat is smaller than the dog.
2. The elephant is the biggest of all.
High/short
1. The tree is smaller than mountmain
2. The mountain is higher than house
3. The mountain is highest of all.
№4
Bartik(я не увидел имя, плохо сфотографировано) is going to watch TV on Tuesday.
Bartik is going to read comics on Wednesday
Bartik is going to write letters on Thursday
Bartik is going to do homework on Friday