—Shall I help you carry your travel case to the train ,Granny? —Oh,no,my boy.It is heavy.Thank you anyway.
The fog was so heavy this morning that drivers could hardly ______ thethings just ten meters away from them.
I ______ a flu when I was on a spring outing with my classmates.
The weather that day may not be as good as expected, in ________ case we will have to put off the event.
Chemical pollution will bring about a threat to agriculture and food chain, and ________ to human health.
—Jenny, I hate to say it, but you really must go! —________.