______ worries me that my daughter plays with her cellphone for a long time every day.
| A．It | B．What | C．This | D．That |
Only those ____knew well could be let in.
| A．who | B．which | C．what | D．he |
The criminal, as well as some ______ people, was arrested by the police yesterday.
| A．relevant | B．skilled | C．evil | D．lucky |
____ with the size of the whole earth, the highest mountain doesn’t seem high at all.
| A．To compare | B．while comparing | C．It comparing | D．when compared |
I ______ my university professor in the supermarket near my house, which was out of my expectation.
| A．came out | B．came across | C．came about | D．came along |
I was not _______her presence till she spoke to me.
| A．aware | B．aware about | C．aware of | D．aware to |