Fill in the blanks with Present Perfect Continuous form of the verbs 1. The foreign species (spread) across the country since January.
a (trang 39 SBT Tiếng Anh 11 Smart World): Fill in the blanks with Present Perfect Continuous form of the verbs. (Điền vào chỗ trống dạng hiện tại hoàn thành tiếp diễn của động từ.)
1. The foreign species (spread) across the country since January.
2. Recently, insects (come) into homes and buildings.
3. The number of native fish (decrease) because of the sea stars.
4. Where _____ these birds (come) from?
5. Human activity (affect) the ecosystem for hundreds of years.
6. We (put) poison out for the rats, but it isn't working.