A survey of the opinions of scientists _____ that three hours of outdoor exercise a week
_____ good for our health.
| A．show; are | B．shows; is | C．show; is | D．shows; are |
He seems too tired today, and I wonderhe got a good sleep last night.
| A．when | B．that | C．if | D．where |
The traveler lost his way in the woods, and made things worse was that it was getting dark.
| A．that | B．what | C．which | D．as |
—I rang you at about nine, but there was no reply.
—Oh, that was probably I was seeing the doctor.
| A．why | B．when | C．what | D．that |
She looks sad. Could you please tell me ____ that prevents her from being as happy as before?
| A．what it is | B．it is what | C．how it is | D．it is how |
I think that this meal was well worth _______ was charged for it.
| A．that | B．what | C．which | D．how many |