We need clean air and water，so we protect the environment．（ ）
| A． |
can |
B． |
may |
C． |
must |
D． |
might |
I was caught in the rain．Even __________，I was late again!（ ）
A．betterB．worseC．furtherD．worst
Rio 2016Olympics will __________ 16days from August 5th to August 21st．（ ）
A．lastB．continueC．countD．keep
Mum always tells me"A smile costs __________，but gives much．"（ ）
A．anythingB．somethingC．everythingD．nothing
I often feel __________ when speaking in public．
Well，just take it easy．（ ）
A．boredB．greatC．nervousD．serious
Excuse me．How can I get to Shanzihe Airport？
Take Shanghai Road，follow the __________ and you can't miss it．（ ）
A．wayB．trafficC．noticesD．signs