Do as sorected 

1only the foundation of the fortress remains (end     ___ fortress )

2 I found this rare stamp in an antique shop.(begin  I came)

3 we did not enjoy ourselves because of the heat(use  ccooler)

4she is petrified of snakes(use petrify )

1. Only the foundation of the fortress remains. (end     ___ fortress )

    The only remains were of the founsation of the fortress.

 

2. I found this rare stamp in an antique shop.(begin  I came)

    I came across this rare stamp in an antique shop.

 

3. We did not enjoy ourselves because of the heat. (use:  cooler)

    We did not enjoy ourselves as there was no cooler.