Many trees _______ on the streets every years. So the air is very fresh now.
举一反三
- They have been very good friends for so many years, but they have nothing ______ common.
- 中国大学MOOC: Green Life has grown ________ in recent years, and over a thousand volunteers now help to plant trees every spring.
- There are fewer plants, trees and flowers in Holland now because ______. A: there has been a lot of conservation in Holland B: Holland does not need so many plants, trees and flowers C: many plants, trees and flowers don't grow there any more D: some plants, trees and flowers are dangerous
- Tom_________in this company for many years, so he is quite familiar with his job now. A: has worked B: works C: worked
- David________in this company for many years, so he is quite familiarwith his job now. A: works B: has worked C: worked D: work