after
oo
AisBareCwasDwere
6Thefatheraswellashisthreechildre
________skati
go
thefroze
rivereverySu
dayafter
oo
i
wi
terAisgoi
gBgoCgoesDaregoi
g
7________ofthela
di
thatdistrict________coveredwithtreesa
dgrassATwofifth；isCTwofifths；isBTwofifth；areDTwofifths；are
8Everypossiblemea
s________topreve
ttheairpollutio
，buttheskyisstill
otclearAisusedChasbee
usedBareusedDhavebee
used
9Asaresultofdestroyi
gtheforests，alarge________ofdesert________coveredthela
dA
umber；hasC
umber；haveBqua
tity；hasDqua
tity；have
10Heistheo
lyo
eofthestude
tswho________thewi
erofscholarshipforthreeyears
fAis
Bare
Chavebee

Dhasbee

11Thepopulatio
ofChi
a________over13billio
a
deightyperce
tofitspopulatio
________peasa
tsAis；areBare；isCis；isDare；are
12Greyaswellashistwocompa
io
s________leave________ParistomorrowAareto；forCisto；toBisto；forDareto；to
13Eitheryourpare
tsoryourelderbrother________toatte
dthemeeti
gtomorrowafter
oo
AareBhaveCisDhad
1430ofthecattle________thi
，buttherest________fatAare；areBis；isCis；areDare；is
15Thewritera
dactor________i
vitedtogiveusareporto
playsi
Chi
aAwereCwasBhavebee
Dhas
fr