________ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.
A. To waitB. Have waitedC. Having waitedD. To have waited
I’m afraid I can’t come to the station to ________, so let’s say goodbye now.
A. see you offB. give you away
C. pick you upD. pay you off
We’ll have a picnic in the Summer Palace this Sunday ________ it rains or it’s very cold.
A. sinceB. ifC. untilD. unless
The conference has been held to discuss the effects of tourism ________ the wildlife in the area.
A. toB. onC. atD. with
—I have got a headache.
—No wonder. You ________ in front of the computer too long.
A. workB. are working
C. workedD. have been working
When I arrived, Bryan took me to see the house ________ I would be staying.
A. whatB. whenC. whereD. which
