The world’s population hit 7 billion on Monday among celebrations and concerns about_______ the growing number of people will affect the earth’s resources [ ]

John told me he’d like to go hiking with me, his voice joy.

_____ she is only 4 years old, ______ she can plays the piano.

.________ gas leaks and similar accidents should occur, some responsible persons should regularly inspect all the laboratories

34. You’d better take more sun _____ . Itis good to your health.