Due to the unreasonable individual income _______, the gap between the rich and poor has become an outstanding issue.
We’ll have to race the clock to complete the work on time.
So much progress _____ in the past few months that she now has no difficulty in making herself understood in English.
Much to my, I’m unable to accept your kind invitation.
—Shall we hang out tomorrow morning? — ________ I’ll save the morning for my essay.
-- Isn’t that Ann’s husband over there? -- No, it ________ be him. I’m sure he doesn’t wear glasses.