Read these sentences and fill in the gaps with 'could', 'can', 'couldn't', 'can't'. 1. Sally talk to customers yesterday as she was a bit nervous. 2. I never memorize all of the rules in the past, and I can do it now either. 3. Steve solve this problem now. He needs time.

• The cars of those times were very small, two-seaters, without a roof, propelled by an engine placed under the seat.

• Combine SKP-02 is designed for harvesting annual and perennial crops with simultaneous watering of the stalks, packing green masses of a strip of harvested grain, moving and shaking the straw.

• Samuel Morse tried to improve the telegraph and invented the telegraph alphabet known as Morse code.

• Transport, which is quite popular in mountainous areas, is the aerial cable car.

• One of the earliest and greatest inventions of mankind was the wheel.

The cars of those times were very small, two-seaters, without a roof, propelled by an engine placed under the seat.

The SKP-02 combine is designed for harvesting annual and perennial crops with simultaneous watering of the stalks, packing green masses of a strip of harvested grain, moving and shaking the straw.

Samuel Morse tried to improve the telegraph and invented the telegraph alphabet known as Morse code.

Transport, which is quite popular in mountainous areas, is the aerial cable car.

One of the earliest and greatest inventions of mankind was the wheel.