The children _____lost in the woods; otherwise, they would have been at the lakeside camp as scheduled. 

 Sir, a Mr. Wang is waiting for you at the gate. ________ he come in or stay there?

—Jim, ________ you answer the last question? -- Sorry, I can’t. It’s too hard.

－ Look! Mrs Green is wearing a black dress today.－ I think she _______ wear red. She looks young in red.

Even students of average intelligence ________ become top students by improving their study habits.