As we can see, Peter is very happy, so he___________ have passed the exam. After all, it’s not difficult at all.
To get a better grade, you should ______ the notes again before the test.
Sometimes proper answers are not far to seek ______ food safety problems.
In that school, English is compulsory for all students, but French and Russian are ______.
Would you like tea or coffee? --_____, thank you. I’ve just had some water.
We can never expect ____ bluer sky unless we create _____less polluted world.