We often provide our children with toys，footballs or basketballs, ________ that all children like these things．

thinking

think

to think

thought

The cost of living in Glasgow is among the lowest in Britain， ________ the quality of life is probably one of the highest．

since

when

as

while

I had just stepped out of the bathroom and was busily drying myself with a towel ________ I heard the steps．

while

when

since

after

When I returned to my hometown，I found it ________ completely．

have changed

has changed

changed

changing

The joke told by Tom made us ________, so our maths teacher couldn’t make himself ________．

laugh; hearing

laugh; heard

laughing; hear

laughed; to be heard

You should understand the traffic rule by now．You’ve had it ________ often enough．

explaining

to explain

explain

explained

The Chinese are proud of the 29th Olympic Games ________ in Beijing in 2008．

hold

holding

held

to be held

The wild flowers looked like a soft orange blanket ________ the desert．

covering

covered

cover

to cover

What I’m fond of is ________ a ride on a horse on a clear day along the grassland,which is surely ________．

take; entertained

taking; entertaining

taking; entertained

taken; entertaining

Oil prices have risen by 32 percent since the start of the year, ________ a record US ＄57.65 a barrel on April 4．

have reached

reaching

to reach

to be reaching