The conference has been held to discuss the effects of tourism ______ the wildlife in the area.
| A．in | B．on | C．at | D．with |
—Mum, where are my new socks?
— How _______ I know? You’d better not put your things everywhere.
| A．shall | B．will | C．should | D．might |
It is not ________ it is useful to study nature but he takes pleasure that the scientist study nature.
| A．until | B．though | C．because | D．since |
I used to go camping a lot, so it wasn’t the first time I ______ in a tent.
| A．will sleep | B．would sleep |
| C．had slept | D．have slept |
The song is sung all over the country, ______ it the most popular song this year.
| A．made | B．having made |
| C．to make | D．making |
I was ________ leave ________ I saw him ________ towards me with a bag in his hand.
| A．about to；when；run | B．about to；when；running |
| C．to about；when；run | D．to about；while；run |