Joan has been missing for a couple of days and there is growing _____for her safety.

The conference has been held to discuss the effects of tourism ________the wildlife in the area.

No chicken or duck ______ in the supermarket since the first case of H7N9 was reported dead

I think students should have mobile phones to call their parents. — _______. They often use them to play games and chat with friends instead

How do I lookwhite, Mike?—Well, I would choose grey．white looks bad aboy with dark skin．