`26` pesticides.

`-` use + N.

`-` pesticide : thuốc trừ sâu (N)
`27` inefficiently.

`-` be + adv + adj.

`-` inefficiently: một cách không hiệu quả (adv)

`28` appliances.

`-` adj + N.

`-` appliance: thiết bị(N)
`29` This is the first time I have experienced such breathtaking beauty as I have on this remote island.

`-` This is the first time + S + have/has + Vpp + O: Đây là lần đầu ai đó làm gì.

`30` Because of the unpredictable weather, we decided to bring umbrellas just in case it rained.

`-` Cụm từ lí do.

`->` Because of + N/Ving + O, S + V + O.

`31` If he didn't eat too much sweet food, he could lose weight.

`-` ĐK2 : If + S + didn't + V + O, S + would/could + V + O.

`32` In spite of being busy, she helped me with the household.

`-` Cụm từ nhượng bộ.

`->` In spite of/Despite + Ving/N + O, S + V + O.