50. The Englishman has a very good ear _____ music. You can ask him for some advice.
| A．at | B．of | C．for | D．In |
There was a time ______ I thought my dad didn’t know a thing about being a good father.
| A．when | B．which | C．that | D．what |
Across China, ordinary people are becoming more and more ______ of the issue of environmental protection.
| A．dependent | B．ignorant | C．alike | D．aware |
At the beginning of a speech, it is very important to grab the audience’s attention and make them interested in ______ you have to say.
| A．which | B．what | C．that | D．who |
China is seeing ______ growing trend in the number of people owning pets and ______ recent survey finds that one in 13 Chinese now keep animals.
| A．the; the | B．a; the | C．a; a | D．the; the |
— Are you cleaning my room, Serena?
— ______. I can’t bear seeing your room in a mess!
| A． You are clever | B．Not at all |
| C．I can’t help it | D．No chance |