$\text{⇒ Answer:}$
$\text{1. B. will be playing.}$
$\text{2. D. am.}$
$\text{3. A. have been. (Thì HTHT).}$
$\text{4. A. has just opened.}$
$\text{5. B. he left.}$
$\text{6. D. goes.}$
$\text{7. B. died. (Thì QKĐ).}$
$\text{8. C. have tried. (Thì HTHT).}$