05

01. I have been working _________ 2 hours

on

in

since

for

02. I have been working _________ 2 hours

on

in

since

for

3. We are waiting _________ the guests.

on

in

since

for

04. I have been working _________ 2 hours

on

in

since

for

05. I have been working _________ 2 hours

on

in

since

for

06. I have been working _________ 2 hours

on

in

since

for

07. I have been working _________ 2 hours

on

in

since

for

08. I have been working _________ 2 hours

on

in

since

for

09. I have been working _________ 2 hours

a) across

b) over

since

for

10. They swam _________ the river.

a) across

b) over

c) through

d) for