Topics: Gerunds
There’s someone_______on the door. Come to see who he/she is.
A. knock
B. knocking
C. to knock
D. having knocked
Select your answer:

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Tenses › ViewI think humans … on Mars one day.
A. are going to live
B. will live
C. live
Vocabulary and Grammar › View
. Which of the following is an example of something that might appear in a reflective essay?
A. Some studies suggest exercise may be beneficial.
B. Many people think exercise is good for health.
C. When I first began training to run my marathon, it was hard.
D. It is often said that exercise can help.
