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`13.` American students have more vacations than Vietnamese ones.

`14.` I spend two hours each day doing my homework.

→ It takes sb + khoảng tgian + to V... 

`=` S + spend + khoảng tgian + V-ing (dành thời gian làm gì)

`15.` Hoa studies hard. 

`16.` It takes me half an hour to get to work. (tương tự c14)

`17.` Is this the cheapest computer you have?

`18.` How much does this dictionary cost?

→ How much + be + S? (giá tiền)

`=` How much + do/does + S + cost? 

`19.` You don't have to finish the work today.

→ It isn't important + for + S + to V..

`=` S + don't/doesn't + have to + V (không cần thiết làm gì)

`20.` Tim's collection has over eight hundred stamps.

@MinhBestEngg