[ Grammar ]
To receive payment, vendors must submit an invoice online … twenty business days of finishing a project.
A. whether
B. whose
C. within
D. while
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Grammar › ViewYou don’t have to decide yet. _________
A. need to
B. needn’t
Present Tenses › View
How long _____ you been studying English?
A. have
B. are
C. do
Grammar › ViewNever postpone till tomorrow what you can do today.
A. take over
B. put off
C. call off
D. turn down
Modal Verbs › View
You look tired. You ____________ go to bed.
A. shall
B. must
C. will
D. should