Lucy knew nothing about it ________ her sister told her.
| A．because | B．until | C．if | D．since |
To ____ your dream of becoming a scientist, you must work hard from now on.
| A．turn | B．recognize | C．live | D．change |
.I suggest ______10% of the bill for the waiter or waitress if a tip isn’t included.
| A．to leave | B．leave | C．being leaved | D．leaving |
There are _____advertisements which encourage ______to participate in improving their neighbourhood.
| A．the public,the public | B．the public,public | C．public,public | D．public ,the public |
Some advertisements_______pictures or words of experts to show people how good the products are.
| A．are consisted of | B．are made of | C．consist of | D．are made up |
Flight 3010______,I must be off now or I’ll be late.
| A．to announce | B．is announced | C．is being announced | D．announced |