By the time you receive this letter, I ___ for Japan.
Đáp án B: By the time + Present Simple, main clause (Future Perfect).
I am sorry I have no time at present to____________________ detail of our plan.
Only one of our gifted students______to participate in the final competition.
We all agree that she is____________________ student in our class.
The boat was sailing north when a terrible storm_____________ .
The pool should not be made so deep______small children can be safe there.
Regular exercise and good diet will bring______fitness and health.
Supporters of free-market globalization point out that_____________________ .
The Lake District,____________________ was made a national park in 1951, attracts a large number of tourists every year.
_______ has been a topic of continual geological research.
Stephanie: "Oh, no! I left my book at home. Can I share yours?" Scott: "______ "